Fix typo in cleaning tmp folders command

bubble-server/src/main/resources/packer/roles/bubble/tasks/main.yml

@@ -125,4 +125,4 @@
     name: "Cleaning tmp folders"
     special_time: "hourly"
     user: "root"
-    job: "find /tmp ~bubble/tmp -mtime +1 -type f -delete && find /tmp ~bubble/tmp -mtime +1 -type d -empty - delete"
+    job: "find /tmp ~bubble/tmp -mtime +1 -type f -delete && find /tmp ~bubble/tmp -mtime +1 -type d -empty -delete"