freak_fortress_2: Fix unlocking capture point is not working

In detail:
- tf_logic_arena's `CapEnableDelay` is only used for setting tf_gamerules_data's `m_flCapturePointEnableTime` before arena round start.
- So, unlocking by alive check actually unlock them if time check ConVar value was not setup(ex. 0.0)
- But if time check ConVar has positive value, even if the number of people is appropriate, it will not be opened until the time is right.

addons/sourcemod/scripting/freak_fortress_2/gamemode.sp

@@ -539,7 +539,7 @@ void Gamemode_CheckPointUnlock(int alive, bool notice)
 			}
 		}
 
-		SetArenaCapEnableTime(0.0);
+		GameRules_SetPropFloat("m_flCapturePointEnableTime", GetGameTime());
 		SetControlPoint(true);
 		PointUnlock = 0;
 	}