Fix tests

Author: FrederikBolding

packages/snaps-controllers/src/interface/SnapInterfaceController.test.tsx

@@ -553,7 +553,7 @@ describe('SnapInterfaceController', () => {
           {},
         ),
       ).toThrow(
-        'Using external images is only permitted with the network access endowment',
+        'Using external images is only permitted with the `endowment:network-access` permission.',
       );
     });
 

packages/snaps-utils/src/ui.test.tsx

@@ -983,7 +983,7 @@ describe('validateJsxElements', () => {
         hasPermission: jest.fn().mockReturnValue(false),
       }),
     ).toThrow(
-      'Using external images is only permitted with the network access endowment.',
+      'Using external images is only permitted with the `endowment:network-access` permission.',
     );
   });
 });