Initialize the screen handling code before the renderer

This change is needed to break a otherwise fatal cycle:
- The renderer calls VID_MenuInit()
- VID_MenuInit() calls SCR_GetMenuScale()
- SCR_GetMenuScale() relies on gl_menuscale which is still
  uninitialized at this time.

src/client/cl_main.c

@@ -873,6 +873,8 @@ CL_Init(void)
 
 	S_Init();
 
+	SCR_Init();
+
 	VID_Init();
 
 	V_Init();
@@ -883,8 +885,6 @@ CL_Init(void)
 
 	M_Init();
 
-	SCR_Init();
-
 	cls.disable_screen = true; /* don't draw yet */
 
 #ifdef CDA