support open with nPlayer (#613)

Co-authored-by: spencerwooo <spencer.woo@outlook.com>

Author: aidenlx

components/previews/VideoPreview.tsx

@@ -159,10 +159,15 @@ const VideoPreview: FC<{ file: OdFileObject }> = ({ file }) => {
             btnImage="/players/vlc.png"
           />
           <DownloadButton
-            onClickCallback={() => window.open(`potplayer://${getBaseUrl()}/${videoUrl}`)}
+            onClickCallback={() => window.open(`potplayer://${getBaseUrl()}${videoUrl}`)}
             btnText="PotPlayer"
             btnImage="/players/potplayer.png"
           />
+          <DownloadButton
+            onClickCallback={() => window.open(`nplayer-http://${getBaseUrl()}${videoUrl}`)}
+            btnText="nPlayer"
+            btnImage="/players/nplayer.png"
+          />
         </div>
       </DownloadBtnContainer>
     </>