Dialer: Make the database compatible with AOSP dialer again.

dialer.db has been at version 10 since cm-14.1/Android N.
Change-Id Ib9369476fa660c44d946b0e41b0d23a34ff14e7c bumped the database
version, making it impossible to restore it on AOSP or any other 3rd
party OS using the AOSP dialer, even though they are still 100%
compatible. Since the bump was only done to delete an unused table,
let's remove that change and roll back the db version to restore
compatibility.

Change-Id: If0f5a1911d43aaa151811f07540bb560814ccb56