medialibrary:fix error display name

Signed-off-by: NQilong Zhang <zhangqilong3@huawei.com>
Change-Id: I0646a21a2436aafb3b3b82c888f0af2b02e09631

multimedia/medialibrary/mediaLibrary_js_standard/entry/src/main/ets/test/fileAssetCallBack2.test.ets

@@ -84,7 +84,7 @@ export default function fileAssetCallBack2Test(abilityContext){
             try {
                 const fetchFileResult = await media.getFileAssets(imagesfetchOp);
                 const asset = await fetchFileResult.getFirstObject();
-                const newName = 'newName' + new Date().getTime();
+                const newName = 'newName' + new Date().getTime() + '.jpg';
                 asset.displayName = newName;
                 const id = asset.id;
                 asset.commitModify(async () => {

multimedia/medialibrary/mediaLibrary_js_standard/entry/src/main/ets/test/fileAssetPromise2.test.ets

@@ -85,7 +85,7 @@ export default function fileAssetPromise2Test(abilityContext){
             try {
                 const fetchFileResult = await media.getFileAssets(imagesfetchOp);
                 const asset = await fetchFileResult.getFirstObject();
-                const newName = 'newName' + new Date().getTime();
+                const newName = 'newName' + new Date().getTime() + '.jpg';
                 asset.displayName = newName;
                 const id = asset.id;
                 await asset.commitModify();