fmt: fix striping modules prefix in orm

[LouisSchmieder]

closes #14732

[spytheman]

Please add the failing (and now fixed) code snippet as a regression test file in say: vlib/v/fmt/tests/orm_module_prefix_keep.vv (the _keep.vv suffix is important, it means that file is checked to be invariant under vfmt (it will be processed by v fmt file.v, and the result should be exactly the same as the input)).

[medvednikov]

Also

 FAIL  [ 92/187]     0.590 ms file vlib/v/fmt/tests/orm_keep.vv after formatting, does not look as expected.

[LouisSchmieder]

I'll look into it later

[LouisSchmieder]

Will continue this pr after the 1th August probably, bc of holidays

[LouisSchmieder]

@spytheman it is done now