Fix mining turfs permenently unlit.

* Mining turfs generated during random mapgen get their opacity changed
without a call to recalc_atom_opacity() becuase the game ticker has not
started.  Make sure we call it even before that point.

code/modules/mining/mine_turfs.dm

@@ -81,8 +81,8 @@ var/list/mining_overlay_cache = list()
 
 /turf/simulated/mineral/proc/update_general()
 	update_icon(1)
+	recalc_atom_opacity()
 	if(ticker && ticker.current_state == GAME_STATE_PLAYING)
-		recalc_atom_opacity()
 		reconsider_lights()
 		if(air_master)
 			air_master.mark_for_update(src)