drop: retain rule.group (filename) after conversion to drop

Ticket: #7805

Author: jasonish

suricata/update/matchers.py

@@ -301,7 +301,7 @@ def match(self, rule):
 
     def run(self, rule):
         drop_rule = suricata.update.rule.parse(re.sub(
-            r"^\w+", "drop", rule.raw))
+            r"^\w+", "drop", rule.raw), rule.group)
         drop_rule.enabled = rule.enabled
         return drop_rule