locale_data: Add new line at the end of script output

Output of cldr2qlocalexml.py looks weird without the final new line.

Task-number: QTBUG-83488
Pick-to: 6.2
Change-Id: I5d675e475c57cdc8101887c39052007ba0a19857
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

util/locale_database/qlocalexml.py

@@ -391,7 +391,7 @@ class QLocaleXmlWriter (object):
                 kvetch('Scripts', self.__scripts)
             if self.__territories:
                 kvetch('Territories', self.__territories)
-            grumble('It may make sense to deprecate them.')
+            grumble('It may make sense to deprecate them.\n')
 
     # Implementation details
     @staticmethod