fix mongno-snap part

rockcraft.yaml

@@ -10,21 +10,18 @@ description: |
   as a NoSQL database program, MongoDB uses JSON
   -like documents with optional schemas.
 license: Apache-2.0 # your application's SPDX license
-
 services:
   mongod:
     summary: Start Mongod
     override: replace
     startup: enabled
     command: "/bin/bash /bin/start.sh"
 
-
 platforms: # The platforms this rock should be built on and run on
   amd64:
 
 parts:
   mongo-snap:
-    plugin: nil
     stage-snaps:
       - charmed-mongodb/6/edge
     overlay-packages:
@@ -62,7 +59,7 @@ parts:
       arr+=('${Source:Version}\n')
       dpkg-query -W -f "${arr[*]}" > ${rocks}/dpkg.query
 
-      ## for snap packages
+      # for snap packages
       cp snap.charmed-mongodb/manifest.yaml ${rocks}
       cp snap.charmed-mongodb/snapcraft.yaml ${rocks}