Pass common.Common to file trees instead of just the Log

We will need a user config in the file tree in the next commit, and passing the
entire common is the easiest way to do that while ensuring hot-reloading when
users change the config while lazygit is running.

pkg/gui/context/commit_files_context.go

@@ -29,7 +29,7 @@ var (
 func NewCommitFilesContext(c *ContextCommon) *CommitFilesContext {
 	viewModel := filetree.NewCommitFileTreeViewModel(
 		func() []*models.CommitFile { return c.Model().CommitFiles },
-		c.Log,
+		c.Common,
 		c.UserConfig().Gui.ShowFileTree,
 	)