Fixed the Premium SMS bug reported by our partner

The detail is that :
===
 <shortcode country="ae" free="3214|1017"/>
===
As displayed above, Arab Emirates is registered in sms_short_codes.xml.
There is only CATEGORY_FREE_SHORT_CODE number for the county code "ae".
All other numbers which include length under 5 digits is set as
CATEGORY_NOT_SHORT_CODE, and so Premium SMS pop-up does not appear for
both case.
pattern="\\d{1,5}"  is added to all similar entries
BUG:66911380

Change-Id: I91b7cc55cc2365e2b956b810775208f0fef187fc
Signed-off-by: Juancheng Rong <juanchengrong@google.com>