device: clear secrets from applied connection during reapply

The applied connection must have no secrets. It's unclear whether
there are any secrets at this point (possibly). To be sure, clear them.

src/devices/nm-device.c

@@ -7503,6 +7503,7 @@ reapply_connection (NMDevice *self,
 		con_old = applied_clone  = nm_simple_connection_new_clone (applied);
 		con_new = applied;
 		nm_connection_replace_settings_from_connection (applied, connection);
+		nm_connection_clear_secrets (applied);
 	} else
 		con_old = con_new = applied;