Use glfwGetFramebufferSize instead of glfwGetWindowSize

glfwGetFramebufferSize is scaled by the display scale.
This fixes the game being shrunk to the bottom left quarter of the window on Wayland HiDPI setups.

Author: valpackett

src/gl/gl3device.cpp

@@ -1156,7 +1156,7 @@ beginUpdate(Camera *cam)
 #ifdef LIBRW_SDL2
 		SDL_GetWindowSize(glGlobals.window, &w, &h);
 #else
-		glfwGetWindowSize(glGlobals.window, &w, &h);
+		glfwGetFramebufferSize(glGlobals.window, &w, &h);
 #endif
 	}else{
 		w = cam->frameBuffer->width;