Make vim_fgets() return the same values as in Vim

The implementation of vim_fgets() differs between Neovim and Vim.

Vim says that it only returns `true` for EOF. But it always returns `true` when
fgets() returns NULL. This happens for EOF _or_ errors.

That probably misguided the author of Neovim's vim_fgets(), which does NOT
return `true` for errors.

Since all the callers of vim_fgets() probably expect it to work as it does in
Vim (and not as it says), it now returns the same values as the Vim
implementation.

Fixes #8227

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