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

This reverts commit 13cd75f099.

platform/android/src/run_loop_impl.hpp

@@ -41,7 +41,6 @@ public:
     ALooper* loop = nullptr;
     RunLoop* runLoop = nullptr;
     util::Atomic<bool> running;
-    bool isDefaultLoop = false;
 
 private:
     friend RunLoop;