Disable resetting WRITE_MEDIA_IMAGES and WRITE_MEDIA_VIDEO appops

App holding System Gallery role is allowed WRITE_MEDIA_* appops by
virtue of the role. This allows the System Gallery app write-access for
images and videos.

When app preferences are reset AppOpsService toggles the appops for
all apps. Only the appops mentioned in sOpDisableReset are not toggled.

Disable WRITE_MEDIA_* appops to reset, as the system gallery app loses
write access on images/videos.

Bug: 179133883
Test: Manual
Change-Id: I168221c641566a9f691ed7956c038206b114d802
Merged-In: I168221c641566a9f691ed7956c038206b114d802