Update import logic to default to non-updatable on mainnet

pages/collections/create.tsx

@@ -1374,6 +1374,10 @@ const CollectionCreationPage: NextPage = () => {
         details.openEditionMinterDetails.offChainMetadataUploadDetails.imageUrl =
           details.openEditionMinterDetails.coverImageUrl
       }
+      if (NETWORK === 'mainnet') {
+        details.collectionDetails.updatable = false
+        details.openEditionMinterDetails.collectionDetails.updatable = false
+      }
 
       setImportedDetails(details)
     }