Todo: Better naming of enum value.

It's not the last, it's the count.

Change-Id: Ib739c34b952af022f83fa0c2d547154d70641456
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/todo/constants.h

@@ -59,7 +59,7 @@ enum OutputColumnIndex {
     OUTPUT_COLUMN_TEXT,
     OUTPUT_COLUMN_FILE,
     OUTPUT_COLUMN_LINE,
-    OUTPUT_COLUMN_LAST
+    OUTPUT_COLUMN_COUNT
 };
 
 const char OUTPUT_COLUMN_TEXT_TITLE[] = QT_TRANSLATE_NOOP("Todo::Internal::TodoItemsModel", "Description");