Add missing R_ApplyGLBuffer() to actually render the player menu.

This fixes part of the player setup menu missing after the GL1 grouped
drawcalls branch was merged.

Submitted by @protocultor in
https://github.com/yquake2/yquake2/pull/1124#issuecomment-2241272507

src/client/refresh/gl1/gl1_main.c

@@ -1161,6 +1161,7 @@ R_SetLightLevel(entity_t *currententity)
 static void
 RI_RenderFrame(refdef_t *fd)
 {
+	R_ApplyGLBuffer();	// menu rendering when needed
 	R_RenderView(fd);
 	R_SetLightLevel (NULL);
 	R_SetGL2D();