Fix Android blank screen (#12604)

Hardcode the variables to 0 on Android

src/client/renderingengine.cpp

@@ -86,8 +86,12 @@ RenderingEngine::RenderingEngine(IEventReceiver *receiver)
 
 	// Resolution selection
 	bool fullscreen = g_settings->getBool("fullscreen");
+#ifdef __ANDROID__
+	u16 screen_w = 0, screen_h = 0;
+#else
 	u16 screen_w = std::max<u16>(g_settings->getU16("screen_w"), 1);
 	u16 screen_h = std::max<u16>(g_settings->getU16("screen_h"), 1);
+#endif
 
 	// bpp, fsaa, vsync
 	bool vsync = g_settings->getBool("vsync");