git-cola: Depend on qtwayland on Linux

[colindean]

This enables git-colato start for me on Bluefin gts-41.20251019.

Fixes #231275

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WIP: I made this edit in GitHub and expect CI to yell at me. It got past the lints I thought would fail, so I'll take it out of draft.

[colindean]

Failure is a "no space left on device". This got past lints that I thought would fail, though.

[colindean]

Something that I thought about this morning: while adding this dependency gets this package (and another new one I'm working on) to work for me since Bluefin uses Wayland, there may be others that are using something else. Maybe this should be in the caveats instead of a hard dependency, unless Homebrew on Linux can detect display manager and depend on the right thing based on that. I can't find anything in the documentation to that effect, though.

[p-linnane]

@colindean Please squash into 1 commit and this should be good to go.

[p-linnane]

Thanks!

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