fix(tf2c): change defaultmap to native TF2C map 4koth_frigid

cp_badlands is a stock TF2 map. 4koth_frigid ships with the TF2C
dedicated server files and does not require TF2 base content on
the client.

lgsm/config-default/config-lgsm/tf2cserver/_default.cfg

@@ -15,7 +15,7 @@ ip="0.0.0.0"
 port="27015"
 clientport="27005"
 sourcetvport="27020"
-defaultmap="cp_badlands"
+defaultmap="4koth_frigid"
 maxplayers="16"
 
 ## Game Server Login Token (GSLT): Optional