Fix phone account component name for voicemail status entries.
Fix phone account component name for voicemail status entries.

Currently was using toString(), switch to "flattenToString" so it is
consistent with the call log.

Bug: 20954214

Change-Id: Ia9ed67bf463e4a2d4d9a02e00243d49238be17fe

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base