fix: build errors

[elisiano]

Currently when building I receive the following errors:

❯ make draculad:manna-harbour_miryoku MIRYOKU_CLIPBOARD=MAC
Making draculad with keymap manna-harbour_miryoku

avr-gcc (Homebrew AVR GCC 8.5.0) 8.5.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Generating: .build/obj_draculad/src/info_config.h                                                   [OK]
Generating: .build/obj_draculad/src/default_keyboard.c                                              [OK]
Generating: .build/obj_draculad/src/default_keyboard.h                                              [OK]
Compiling: keyboards/draculad/draculad.c                                                            [OK]
Compiling: .build/obj_draculad/src/default_keyboard.c                                               [OK]
Compiling: quantum/keymap_introspection.c                                                          In file included from quantum/keymap_introspection.c:9:
users/manna-harbour_miryoku/manna-harbour_miryoku.c: In function 'u_td_fn_U_SYM':
users/manna-harbour_miryoku/manna-harbour_miryoku.c:29:23: error: unsigned conversion from 'int' to 'layer_state_t' {aka 'unsigned char'} changes value from '256' to '0' [-Werror=overflow]
     default_layer_set((layer_state_t)1 << U_##LAYER); \
                       ^~~~~~~~~~~~~~~~~~~~~~
users/manna-harbour_miryoku/miryoku_babel/miryoku_layer_list.h:20:1: note: in expansion of macro 'MIRYOKU_X'
 MIRYOKU_X(SYM,    "Sym") \
 ^~~~~~~~~
users/manna-harbour_miryoku/manna-harbour_miryoku.c:32:1: note: in expansion of macro 'MIRYOKU_LAYER_LIST'
 MIRYOKU_LAYER_LIST
 ^~~~~~~~~~~~~~~~~~
users/manna-harbour_miryoku/manna-harbour_miryoku.c: In function 'u_td_fn_U_FUN':
users/manna-harbour_miryoku/manna-harbour_miryoku.c:29:23: error: unsigned conversion from 'int' to 'layer_state_t' {aka 'unsigned char'} changes value from '512' to '0' [-Werror=overflow]
     default_layer_set((layer_state_t)1 << U_##LAYER); \
                       ^~~~~~~~~~~~~~~~~~~~~~
users/manna-harbour_miryoku/miryoku_babel/miryoku_layer_list.h:21:1: note: in expansion of macro 'MIRYOKU_X'
 MIRYOKU_X(FUN,    "Fun")
 ^~~~~~~~~
users/manna-harbour_miryoku/manna-harbour_miryoku.c:32:1: note: in expansion of macro 'MIRYOKU_LAYER_LIST'
 MIRYOKU_LAYER_LIST
 ^~~~~~~~~~~~~~~~~~
quantum/keymap_introspection.c: At top level:
quantum/keymap_introspection.c:20:1: error: static assertion failed: "Number of keymap layers exceeds maximum set by LAYER_STATE_(8|16|32)BIT"
 _Static_assert(NUM_KEYMAP_LAYERS <= MAX_LAYER, "Number of keymap layers exceeds maximum set by LAYER_STATE_(8|16|32)BIT");
 ^~~~~~~~~~~~~~
cc1: all warnings being treated as errors
 [ERRORS]
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make[1]: *** [.build/obj_draculad_manna-harbour_miryoku/quantum/keymap_introspection.o] Error 1
make: *** [draculad:manna-harbour_miryoku] Error 1
Make finished with errors

The assertion was introduced recently(ish) so I just commented that out.

For the type casting errors I just added a surrounding parenthesis to the shifted value.

I am not sure if this is the correct way to fix this, but it prevents the build errors for now.

[manna-harbour]

The problem with building for draculad is this line: https://github.com/qmk/qmk_firmware/blob/92354b2ca876b6b5dbcb5d34aa34fda6a473bb1a/keyboards/draculad/config.h#L61. It should be removed, or moved to keyboards/draculad/keymaps/default/config.h.

You might like to submit a PR upstream to QMK to fix it. Draculad is maintained by @MangoIV, but this line was added in qmk/qmk_firmware#11930 by @tzarc.