Revert "[android] Do not create Timers on Default main loops"

This reverts commit 13cd75f099.

platform/android/src/run_loop.cpp

@@ -80,8 +80,6 @@ RunLoop::Impl::Impl(RunLoop* runLoop_, RunLoop::Type type) : runLoop(runLoop_) {
     case Type::Default:
         ret = ALooper_addFd(loop, fds[PIPE_OUT], ALOOPER_POLL_CALLBACK,
             ALOOPER_EVENT_INPUT, looperCallbackDefault, this);
-        running = true;
-        isDefaultLoop = true;
         break;
     }