Remove some dead code in tests_modify (views.py).

This should fix #1843 (comment)

server/fishtest/views.py

@@ -1107,15 +1107,6 @@ def tests_modify(request):
             request.session.flash("Unable to modify another user's run!", "error")
             return home(request)
 
-        existing_games = 0
-        for chunk in run["tasks"]:
-            existing_games += chunk["num_games"]
-            if "stats" in chunk:
-                stats = chunk["stats"]
-                total = stats["wins"] + stats["losses"] + stats["draws"]
-                if total < chunk["num_games"]:
-                    chunk["pending"] = True
-
         num_games = int(request.POST["num-games"])
         if (
             num_games > run["args"]["num_games"]