Deduplicate day-name data in QLocaleXML files

This is a follow-up to commit ebb0212133bd91f1da4931b29eb1d33fb77b1444.
The day name data appeared twice in the XML files.
Skip the second copy, saving 8.8% of the intermediate file-size.
This makes no change to generated QLocale data.

Change-Id: Ic2cc543a2a85cbb1d2d47ebac7df4fa9ad6ee0a7
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

util/locale_database/qlocalexml.py

@@ -200,8 +200,6 @@ class Locale:
                     'weekendStart', 'weekendEnd',
                     'longDateFormat', 'shortDateFormat',
                     'longTimeFormat', 'shortTimeFormat',
-                    'longDays', 'shortDays', 'narrowDays',
-                    'standaloneLongDays', 'standaloneShortDays', 'standaloneNarrowDays',
                     'currencyIsoCode', 'currencySymbol', 'currencyDisplayName',
                     'currencyFormat', 'currencyNegativeFormat'
                     ) + tuple(self.propsMonthDay('days')) + tuple(