ci: Don't use guioptions-k in Vim tests, clean up defaults for gui tests#1530

ychin merged 1 commit intomacvim-dev:mastermacvim-dev/macvim:masterfrom

ychin:vim-tests-dont-use-guioptions-kychin/macvim:vim-tests-dont-use-guioptions-kCopy head branch name to clipboard