fix multiple assignment to sys_type

app.py

@@ -138,11 +138,9 @@ def add_solution_cbk(
             return styled_error("Failed to read JSONL submission file. Please try again later.")
 
         # Validating all user-supplied arguments.
-        sys_type = "default"  # Placeholder
         for val, val_name in [
             (system_name, "System name"),
             (org, "Organisation name"),
-            # (sys_type, "System type"),
         ]:
             if len(val) == 0:
                 return styled_error(f"Please fill in the '{val_name}' field.")
@@ -163,7 +161,6 @@ def add_solution_cbk(
         user_id,
         system_name,
         org,
-        sys_type,  # Passing the placeholder
         submission_path,
         is_warmup_dataset=(SPLIT == "warmup"),
         ensure_all_present=ENSURE_ALL_PRESENT,