platform: Fix the gid for the theme manager service

It was mismatched with fs_config, resulting in attribution of the
"-1" gid

Change-Id: Ia6d55af0b39f659da2965f9bc0bda0df5c775ba4
Merge "platform: Fix the gid for the theme manager service" into cm-10.2
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2