vim: Amend disable GUI configure flag
vim: Amend disable GUI configure flag

Disabling vim GUI should be configured with `--disable-gui` flag
instead.

Installing from existing vim bottle and building from source with the
`--disable-gui` flag do not seem to differ. Both installs `(2,034 files,
36.0MB)`. Probably GUI is disabled anyway with `--without-x` flag.

References:

  - [vim Makefile][1]
  - [Arch Linux's vim build][2]
  - [`--without-x` documentation][3]

[1]: https://github.com/vim/vim/blob/05cf63e9bdca1ac070df3e7d9c6dfc45e68ac916/src/Makefile#L329
[2]: https://github.com/archlinux/svntogit-packages/blob/f5d177ef1aae59ffb73f7aef3e7d3d216cae409e/trunk/PKGBUILD#L55
[3]: https://github.com/vim/vim/blob/05cf63e9bdca1ac070df3e7d9c6dfc45e68ac916/src/Makefile#L549-L554

Closes #100749.

Signed-off-by: Sean Molenaar <2b250e3fea88cfef248b497ad5fc17f7dc435154@users.noreply.github.com>
Signed-off-by: BrewTestBot <8a898ee6867e4f2028e63d2a6319b2224641c06c@users.noreply.github.com>

nandub/homebrew-core,lemzwerg/homebrew-core,stgraber/homebrew-core,nandub/homebrew-core,chrisfinazzo/homebrew-core,makigumo/homebrew-core,filcab/homebrew-core,Homebrew/homebrew-core,Homebrew/homebrew-core,nbari/homebrew-core,stgraber/homebrew-core,zyedidia/homebrew-core,chrisfinazzo/homebrew-core,nbari/homebrew-core,zyedidia/homebrew-core,lemzwerg/homebrew-core,adam-moss/homebrew-core,makigumo/homebrew-core,filcab/homebrew-core,adam-moss/homebrew-core,sjackman/homebrew-core,sjackman/homebrew-core