Handle cache update when creating new metadata

In case the metadata didn't exist yet, it was never added to the meta array because the objects meta field was never updated

src/lib/graphql/mutations/SourceMutation.ts

@@ -7,7 +7,7 @@
  */
 
 import gql from 'graphql-tag';
-import { SOURCE_SETTING_FIELDS } from '@/lib/graphql/fragments/SourceFragments.ts';
+import { SOURCE_META_FIELDS, SOURCE_SETTING_FIELDS } from '@/lib/graphql/fragments/SourceFragments.ts';
 import { MANGA_BASE_FIELDS } from '@/lib/graphql/fragments/MangaFragments.ts';
 
 export const GET_SOURCE_MANGAS_FETCH = gql`
@@ -36,12 +36,12 @@ export const UPDATE_SOURCE_PREFERENCES = gql`
 `;
 
 export const SET_SOURCE_METADATA = gql`
+    ${SOURCE_META_FIELDS}
+
     mutation SET_SOURCE_METADATA($input: SetSourceMetaInput!) {
         setSourceMeta(input: $input) {
             meta {
-                sourceId
-                key
-                value
+                ...SOURCE_META_FIELDS
             }
         }
     }