Fix createKnowledgeSource mutation (#199)

Author: andrewblaney

.changeset/fast-ants-ask.md

@@ -0,0 +1,5 @@
+---
+'@team-plain/typescript-sdk': patch
+---
+
+Fix createKnowledgeSource changeset

src/graphql/mutations/createKnowledgeSource.gql

@@ -4,14 +4,7 @@ mutation createKnowledgeSource($input: CreateKnowledgeSourceInput!) {
       ...KnowledgeSourceParts
     }
     error {
-      type
-      code
-      message
-      fields {
-        type
-        field
-        message
-      }
+      ...MutationErrorParts
     }
   }
 }