Fix bash spells doing nothing to walls and windows

[chaosvolt]

Summary

SUMMARY: Bugfixes "Trivial bugfix for bash spell effect not working against impassible terrain"

Purpose of change

This fixes a long-running bug that @foulman reported in DDA ages ago: CleverRaven/Cataclysm-DDA#38077 in which bash spells do absolutely nothing to solid terrain like doors, walls, or even windows.

Turns out, the code for it is immensely, hilariously easy to fix. As in, the sort of thing @KorGgenT could've fixed over 2 years ago with literally just the flip of a single boolean.

Describe the solution

Literally just set the ignore_walls boolean in area defintion for spell_effect::bash to true.

Describe alternatives you've considered

Pestering someone else to do it.

Testing

1. Loaded in an existing release, debugged all spells plus 1000 INT, tested Artifact Pulse to confirm that windows only get yote when they're opened.
2. Compiled and load-tested.
3. Repeated step one in compiled build, terrain correctly suffers bashing even when impassible.

Additional context

This will allow me to remove the "ter_transform subspells as a workaound" hack I've been using to deal with this for Arcana's bash spell effects.

Ideally if we get someone to port this to DDA that'd be nice. Tested and it looks like somehow their version of spell shape code properly bashes walls if it has IGNORES_WALLS, so it's actually fixed on their end but no one took notice of it.