Put screen effects render handling inside a function

This de-duplicates the screen effects rendering code by putting it
inside a function, Graphics::renderwithscreeneffects(), and using that
instead of copy-pasted code.

desktop_version/src/Graphics.cpp

@@ -2667,6 +2667,23 @@ void Graphics::render()
 	}
 }
 
+void Graphics::renderwithscreeneffects()
+{
+	if (game.flashlight > 0 && !game.noflashingmode)
+	{
+		graphics.flashlight();
+	}
+
+	if (game.screenshake > 0 && !game.noflashingmode)
+	{
+		graphics.screenshake();
+	}
+	else
+	{
+		graphics.render();
+	}
+}
+
 void Graphics::bigrprint(int x, int y, std::string& t, int r, int g, int b, bool cen, float sc)
 {
 	if (r < 0) r = 0;