Fix key conflict with self after master device re-install

Fix bug where re-installing would cause sync messages to fail and
produce unresolvable error indicators on messages that were actually
sent.

// FREEBIE

libtextsecure/account_manager.js

@@ -106,6 +106,10 @@
                     textsecure.storage.remove('device_name');
                     textsecure.storage.remove('regionCode');
 
+                    // remove our own identity key, which may have changed
+                    // if we're relinking after a reinstall on the master device
+                    textsecure.storage.axolotl.removeIdentityKey(number);
+
                     textsecure.storage.put('identityKey', identityKeyPair);
                     textsecure.storage.put('signaling_key', signalingKey);
                     textsecure.storage.put('password', password);