Changes syndi team radio display text

From 'syndteam' to '#unid'. Close enough to '#unkn' used by normal
traitor, but distinct enough you can tell them apart.

code/controllers/communications.dm

@@ -144,9 +144,6 @@ var/list/radiochannels = list(
 // central command channels, i.e deathsquid & response teams
 var/list/CENT_FREQS = list(ERT_FREQ, DTH_FREQ)
 
-// Channels that show up as '#unkn'
-var/list/UNKN_FREQS = list(SYND_FREQ)
-
 // Antag channels, i.e. Syndicate
 var/list/ANTAG_FREQS = list(SYND_FREQ, SYNDTEAM_FREQ)
 

code/defines/procs/radio.dm

@@ -7,13 +7,16 @@
 	var/freq_text
 
 	// the name of the channel
-	if(display_freq in UNKN_FREQS)
-		freq_text = "#unkn"
-	else
-		for(var/channel in radiochannels)
-			if(radiochannels[channel] == display_freq)
-				freq_text = channel
-				break
+	switch(display_freq)
+		if(SYND_FREQ)
+			freq_text = "#unkn"
+		if(SYNDTEAM_FREQ)
+			freq_text = "#unid"
+		else
+			for(var/channel in radiochannels)
+				if(radiochannels[channel] == display_freq)
+					freq_text = channel
+					break
 
 	// --- If the frequency has not been assigned a name, just use the frequency as the name ---
 	if(!freq_text)