Fixed a small bug in ZSpawn where if you connect, and then click cancel it thinks you have already played in the game.

src/zr/zombiereloaded.inc

@@ -248,6 +248,7 @@ stock bool:ZRIsClientAdmin(client, AdminFlag:flag = Admin_Generic)
     {
         return false;
     }
+    
     // If client doesn't have the Admin_Generic flag, then stop.
     if (!GetAdminFlag(GetUserAdmin(client), flag))
     {

src/zr/zspawn.inc

@@ -72,6 +72,12 @@ ZSpawnOnMapStart()
  */
 ZSpawnOnClientDisconnect(client)
 {
+    // So people who are connecting that click "cancel" aren't added to the list.
+    if (!IsClientInGame(client))
+    {
+        return;
+    }
+    
     // Check if client is a bot.
     if (IsFakeClient(client))
     {