Adds an extra signaler check to compare frequencies with the incoming signal (#64666)

Fixes setting signallers frequency.

code/game/objects/items/devices/pressureplates.dm

@@ -29,7 +29,7 @@
 	if(roundstart_signaller)
 		sigdev = new
 		sigdev.code = roundstart_signaller_code
-		sigdev.frequency = roundstart_signaller_freq
+		sigdev.set_frequency(roundstart_signaller_freq)
 
 	if(undertile_pressureplate)
 		AddElement(/datum/element/undertile, tile_overlay = tile_overlay, use_anchor = TRUE)

code/modules/assembly/signaler.dm

@@ -98,9 +98,8 @@
 			INVOKE_ASYNC(src, .proc/signal)
 			. = TRUE
 		if("freq")
-			frequency = unformat_frequency(params["freq"])
-			frequency = sanitize_frequency(frequency, TRUE)
-			set_frequency(frequency)
+			var/new_frequency = sanitize_frequency(unformat_frequency(params["freq"]), TRUE)
+			set_frequency(new_frequency)
 			. = TRUE
 		if("code")
 			code = text2num(params["code"])

code/modules/modular_computers/file_system/programs/signaler.dm

@@ -46,9 +46,8 @@
 			INVOKE_ASYNC(src, .proc/signal)
 			. = TRUE
 		if("freq")
-			signal_frequency = unformat_frequency(params["freq"])
-			signal_frequency = sanitize_frequency(signal_frequency, TRUE)
-			set_frequency(signal_frequency)
+			var/new_signal_frequency = sanitize_frequency(unformat_frequency(params["freq"]), TRUE)
+			set_frequency(new_signal_frequency)
 			. = TRUE
 		if("code")
 			signal_code = text2num(params["code"])