reorder transfer checks so as to ensure sending 2B FIL to yourself fails if you don't have that amount

[laudiacay]

Fixes #7596.

[jennijuju]

is this rebased onto or based off the right branch?

[arajasek]

Some nits

[codecov]

Codecov Report

Merging #7637 (187a392) into next (9d44893) will increase coverage by 0.04%.
The diff coverage is 42.55%.

❗ Current head 187a392 differs from pull request most recent head 6fa8d40. Consider uploading reports for the commit 6fa8d40 to get more accurate results

@@            Coverage Diff             @@
##             next    #7637      +/-   ##
==========================================
+ Coverage   39.50%   39.55%   +0.04%     
==========================================
  Files         646      646              
  Lines       68376    68400      +24     
==========================================
+ Hits        27015    27054      +39     
+ Misses      36722    36702      -20     
- Partials     4639     4644       +5     

Impacted Files	Coverage Δ
chain/vm/runtime.go	54.20% <0.00%> (ø)
chain/vm/vm.go	63.34% <43.47%> (+0.33%)	⬆️
blockstore/api.go	24.00% <0.00%> (-8.00%)	⬇️
blockstore/blockstore.go	62.96% <0.00%> (-7.41%)	⬇️
node/hello/hello.go	63.63% <0.00%> (-3.41%)	⬇️
chain/sub/incoming.go	54.43% <0.00%> (-3.38%)	⬇️
chain/actors/builtin/market/v7.go	45.16% <0.00%> (-1.62%)	⬇️
extern/storage-sealing/fsm.go	55.77% <0.00%> (-1.20%)	⬇️
chain/events/state/predicates.go	53.09% <0.00%> (-1.04%)	⬇️
chain/messagepool/messagepool.go	57.79% <0.00%> (-0.62%)	⬇️
... and 16 more

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