Make photos/videos storage preference normal.

We had special behavior for it in the past, but this defines new
behavior that is much closer to what the other storage preferences do.
A photo app filter is used and a photos/video files preference exists on
it which intents over to the gallery app.

Fixes: 64147318
Test: Settings robotests

Change-Id: I47284515fe2dfcc924ae61a44bc47051e9f5fda6