[core] Fix broadcast receiver after soft reboot (#739)

`sendToBridge` stucks the binder thread so that
`ActivityManagerService`'s receipent won't be called

core/src/main/java/org/lsposed/lspd/service/BridgeService.java

@@ -94,7 +94,7 @@ public class BridgeService {
             bridgeService.unlinkToDeath(this, 0);
             bridgeService = null;
             listener.onSystemServerDied();
-            sendToBridge(serviceBinder, true);
+            new Thread(()-> sendToBridge(serviceBinder, true)).start();
         }
     };