Revert "Comment out CustomEditTextPreferenceTest which is failing..."

This reverts commit 4dce2510f3fe76c2b883de5cca80f9d421cf9370.

Reason for revert: Breakage fixed by ag/3647277.

Change-Id: I827ea4a66b6b083040ae88f57e79bf6de728ad5e
1 file changed