37544704 PduPersister is not doing a safe Uri comparison

* The PduPersister had some code where it checked uris for
equality, but didn't use the safe .equals method.

Test: manual test of sending and receiving mms's.

Bug: 37544704

Change-Id: I6dfd037068b4eff04c34cd9d41760e36e11915d6
1 file changed