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/SourceFragments.ts

@@ -8,6 +8,14 @@
 
 import gql from 'graphql-tag';
 
+export const SOURCE_META_FIELDS = gql`
+    fragment SOURCE_META_FIELDS on SourceMetaType {
+        sourceId
+        key
+        value
+    }
+`;
+
 export const SOURCE_BASE_FIELDS = gql`
     fragment SOURCE_BASE_FIELDS on SourceType {
         id
@@ -47,6 +55,7 @@ export const SOURCE_LIST_FIELDS = gql`
 
 export const SOURCE_BROWSE_FIELDS = gql`
     ${SOURCE_BASE_FIELDS}
+    ${SOURCE_META_FIELDS}
 
     fragment SOURCE_BROWSE_FIELDS on SourceType {
         ...SOURCE_BASE_FIELDS
@@ -55,9 +64,7 @@ export const SOURCE_BROWSE_FIELDS = gql`
         supportsLatest
 
         meta {
-            sourceId
-            key
-            value
+            ...SOURCE_META_FIELDS
         }
 
         filters {