ctf_chat: Add missing priv check in default chat message handler

ctf_chat/init.lua

@@ -441,6 +441,10 @@ else
 				end
 			end
 
+			if not minetest.check_player_privs(name, {shout = true}) then
+				minetest.chat_send_player("-!- You don't have permission to shout.")
+				return true
+			end
 			local tcolor = ctf_colors.get_color(ctf.player(name))
 			minetest.chat_send_all(minetest.colorize(tcolor.css, "<" .. name .. "> ") .. message)
 			return true