Freed motd variables after MOTD is set

sv_motd.cfg

@@ -16,4 +16,13 @@ set plimit      "\n\nActive Player Limits:"
 #   set pl "N/A"
 #endif
 
-sv_motd "$plimit $pl $border $welcome $irc_gate $cts_lbs $duel_maps"
+sv_motd "$plimit $pl $border $welcome $irc_gate $cts_lbs $duel_maps"
+
+unset welcome
+unset irc_gate
+unset cts_lbs
+unset duel_maps
+unset border
+unset match_info
+unset plimit
+unset pl