units: don't load squasfs/erofs kmods explicitly

units: don't load squasfs/erofs kmods explicitly

File system modules should be something the kernel can autoload
automatically, and according to my testing that works fine, hence let's
drop the explicit deps, in particular as systems usually stick to one fs
for these things, not both.

I inquired bluca about the reason to add it, and didn't remember
anymore, and was fine with me removing this. So let's remove this for
now, should issues arise we can revert this.