Return if classname equals player's class

Author: a-blob

mods/ctf/ctf_modes/ctf_mode_classes/classes.lua

@@ -391,6 +391,10 @@ local function select_class(player, classname)
 	player = PlayerObj(player)
 	if not player then return end
 
+	if classname == classes.get_name(player) then
+		return
+	end
+
 	if ctf_modebase.current_mode == "classes" and dist_from_flag(player) <= 5 then
 		cooldowns:set(player, CLASS_SWITCH_COOLDOWN)
 		classes.set(player, classname)