datetime: Fix date endianess for en_HK

Hong Kong people expect to use a little endian date in English. (and a
big endian date in Chinese)

The D_FMT format string for en_HK is '%A, %B %d, %Y', which the current
code parses as middle endian.

This commit makes the code parse it as little endian, that is it doesn't
ignore the %A formatter any more.

en_HK is the only UTF-8 locale with this D_FMT format string, so this
shouldn't change anything for other locales.

https://bugzilla.gnome.org/show_bug.cgi?id=750781

panels/datetime/date-endian.c

@@ -94,6 +94,7 @@ date_endian_get_default (gboolean verbose)
 			return DEFAULT_ENDIANESS;
 		}
 		switch (c) {
+		case 'A':
 		case 'd':
 		case 'e':
 			if (has_item (items, ITEM_DAY) == FALSE) {
@@ -116,7 +117,6 @@ date_endian_get_default (gboolean verbose)
 				i++;
 			}
 			break;
-		case 'A':
 		case 'a':
 			/* Ignore */
 			;