Gallery2: Storage configuration options gallery side (2/2)

good idea to keep them in sync for camera options in Gallery

Change-Id: Ie487323edce58f174b4956a2e832ac4c121309ef
Add WRITE_MEDIA_STORAGE permission

This fixes the issue where the images/pics are not
deleted from the android external 'SD Card' as android does not
allow writing to the external 'SD Card' with just the
WRITE_EXTERNAL_STORAGE permission.

Requires : https://gerrit.slimroms.net/#/c/2723

Change-Id: I34377160b8b8677abc3506d8aca72166b4129425