do not allow alive players to revive, by using the browser refresh

revive.py

@@ -2,6 +2,9 @@
 from backend import update_user_data
 
 def revive(user, user_data, league, usersdb):
+    if user_data.get("alive", True):
+        return "You are already alive and cannot revive yourself."
+
     exp = user_data.get("exp", 0)
     revive_cost = 1000  # Static cost of 1000 action points
     exp_deduction = math.ceil(exp * 0.1)  # 10% of current experience