feat(gnofmt): delete trailing whitespaces

[moul]

Context: was working on #4211 and noticed that make fmt and make test.sync aren't compatible...

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This change may not be what we want, but I would like to propose it to gather opinions.

I believe that if we do not allow gnofmt to ignore trailing whitespaces, we should still expect this repository to adhere to this rule. Perhaps we could implement a second rule in "make fmt" that calls another binary.

1. This creates inconsistency, which editors sometimes alter. As a result, we occasionally see changes occurring simply because someone opened a file in their editor.
2. It also leads to strange behaviors with the auto-generated outputs in filetest. I prefer to address the problem at the source, but another option could be to ensure that filetest generates clean output.

In addition to reviewing my implementation, please share your thoughts.

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[jaekwon]

I don't think it's a good idea because it manipulates strings. See examples/gno.land/r/mouss/home/home.gno.
Does this have to do with filetest .Sync? There's some regression in the way directives are parsed and/or printed. The previous version had issues too, making too many directives. If you show me exactly how to replicate the problem (e.g. which file) then I can try to fix it in filetests directives handling.

But this fix doesn't work because it manipulates declared string constants.