fixup! Allow rewording for last commit using GPG

Reduce code noise by using nil instead of an empty function that returns nil

pkg/gui/controllers/local_commits_controller.go

@@ -405,9 +405,7 @@ func (self *LocalCommitsController) handleReword(summary string, description str
 	if models.IsHeadCommit(self.c.Model().Commits, self.c.Contexts().LocalCommits.GetSelectedLineIdx()) {
 		// we've selected the top commit so no rebase is required
 		err = self.c.Helpers().GPG.WithGpgHandling(self.c.Git().Commit.RewordLastCommit(summary, description),
-			self.c.Tr.CommittingStatus, func() error {
-				return nil
-			})
+			self.c.Tr.CommittingStatus, nil)
 	} else {
 		err = self.c.Git().Rebase.RewordCommit(self.c.Model().Commits, self.c.Contexts().LocalCommits.GetSelectedLineIdx(), summary, description)
 	}