Fix a race condition when entering and exiting a preference fragment quickly.

Bug: 3413715

Fragment was going through STARTED/RESUMED/STARTED/CREATED very quickly and
bindPreferences() was a delayed call that happened after mView was nullified.
Removing the MSG_BIND_PREFERENCES when view is destroyed.

Change-Id: Iec43102c004a266c412b993f17e1a8c1699fb0b1