fix unit test

Author: thomasneirynck

x-pack/plugins/maps/public/classes/sources/mvt_single_layer_vector_source/mvt_single_layer_vector_source.test.tsx

@@ -84,7 +84,7 @@ describe('getImmutableSourceProperties', () => {
     const source = new MVTSingleLayerVectorSource(descriptor);
     const properties = await source.getImmutableProperties();
     expect(properties).toEqual([
-      { label: 'Data source', value: '.pbf vector tiles' },
+      { label: 'Data source', value: 'Vector tiles' },
       { label: 'Url', value: 'https://example.com/{x}/{y}/{z}.pbf' },
     ]);
   });