Fix patch commands when git config has color=always (#5405)

This is the same option as used by
pkg.commands.git_commands.diff.GetDiff().

This fixes some operations patch operation (tested with moving patch to
another commit) with `git config set --global color.ui always` (or
`color.diff always`).

pkg/commands/git_commands/patch.go

@@ -346,7 +346,7 @@ func (self *PatchCommands) PullPatchIntoNewCommitBefore(
 func (self *PatchCommands) diffHeadAgainstCommit(commit *models.Commit) (string, error) {
 	cmdArgs := NewGitCmd("diff").
 		Config("diff.noprefix=false").
-		Arg("--no-ext-diff").
+		Arg("--no-ext-diff", "--no-color").
 		Arg("HEAD.." + commit.Hash()).
 		ToArgv()