fix: link the exact stream in discussion:validate fulfilled comments

The fulfilled comment looked for the first line containing the stream ID
as a substring, so a request for MTV.fr@SD linked the line of
BFMTV.fr@SD. Match the quoted tvg-id attribute instead.

tests/__data__/input/discussion_validate/streams/br.m3u

@@ -1,3 +1,5 @@
 #EXTM3U
+#EXTINF:-1 tvg-id="NewCNBCe.tr@SD",New CNBCe
+https://example.com/newcnbce.m3u8
 #EXTINF:-1 tvg-id="CNBCe.tr@SD",CNBCe
 https://ythls.onrender.com/channel/UC40TUSUx490U5uR1lZt3Ajg.m3u8

tests/commands/discussion/validate.test.ts

@@ -28,7 +28,9 @@ describe('discussion:validate', () => {
     const result = readResultJson()
     expect(result.status).toBe('fulfilled')
     expect(result.label).toBe('check:failed')
-    expect(result.comment).toContain('https://github.com/test-owner/test-repo/blob/main/')
+    expect(result.comment).toContain(
+      'https://github.com/test-owner/test-repo/blob/main/streams/br.m3u#L4-L5'
+    )
     expect(result.close).toBe('true')
   })