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/fragments/MangaFragments.ts

@@ -8,6 +8,14 @@
 
 import gql from 'graphql-tag';
 
+export const MANGA_META_FIELDS = gql`
+    fragment MANGA_META_FIELDS on MangaMetaType {
+        mangaId
+        key
+        value
+    }
+`;
+
 export const MANGA_BASE_FIELDS = gql`
     fragment MANGA_BASE_FIELDS on MangaType {
         id
@@ -64,14 +72,13 @@ export const MANGA_CHAPTER_NODE_FIELDS = gql`
 
 export const MANGA_READER_FIELDS = gql`
     ${MANGA_BASE_FIELDS}
+    ${MANGA_META_FIELDS}
 
     fragment MANGA_READER_FIELDS on MangaType {
         ...MANGA_BASE_FIELDS
 
         meta {
-            mangaId
-            key
-            value
+            ...MANGA_META_FIELDS
         }
 
         chapters {