standardize pause & resume logic on GLSurfaceView (#19256)

Author: drelaptop

cocos/platform/android/java/src/org/cocos2dx/lib/Cocos2dxActivity.java

@@ -287,6 +287,7 @@ public void init() {
 
         // Cocos2dxGLSurfaceView
         this.mGLSurfaceView = this.onCreateView();
+        this.mGLSurfaceView.setPreserveEGLContextOnPause(true);
 
         // ...add to FrameLayout
         mFrameLayout.addView(this.mGLSurfaceView);

cocos/platform/android/java/src/org/cocos2dx/lib/Cocos2dxGLSurfaceView.java

@@ -199,7 +199,7 @@ public void run() {
             }
         });
         this.setRenderMode(RENDERMODE_WHEN_DIRTY);
-        //super.onPause();
+        super.onPause();
     }
 
     @Override