Fix the invalid default scenario

The previous scenario was invalid and the server couldn't start.

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

@@ -15,8 +15,8 @@ port="27102"
 queryport="27131"
 servername="LinuxGSM Server"
 serverpassword=""
-defaultmap="Oilfield"
-defaultscenario="Scenario_Oilfield_Push_Security"
+defaultmap="Canyon"
+defaultscenario="Scenario_Crossing_Push_Security"
 maxplayers="28"
 
 ## Server Start Command | https://github.com/GameServerManagers/LinuxGSM/wiki/Start-Parameters#additional-parameters