Store full ref in Name field of update-ref commits

Strip the prefix at presentation time instead. This makes it easier to find
update-ref todos in order to move them up/down, or delete them.

pkg/gui/presentation/commits.go

@@ -342,6 +342,9 @@ func displayCommit(
 	}
 
 	name := commit.Name
+	if commit.Action == todo.UpdateRef {
+		name = strings.TrimPrefix(name, "refs/heads/")
+	}
 	if parseEmoji {
 		name = emoji.Sprint(name)
 	}