Revert "Ignore 403 Forbidden streams when getting manifest"

This reverts commit 52b2539.

Author: Tyrrrz

YoutubeExplode/Videos/Streams/StreamClient.cs

@@ -58,10 +58,7 @@ CancellationToken cancellationToken
             contentLength = response.Content.Headers.ContentLength;
 
             // 404 error indicates that the stream is not available
-            if (
-                response.StatusCode == HttpStatusCode.NotFound
-                || response.StatusCode == HttpStatusCode.Forbidden
-            )
+            if (response.StatusCode == HttpStatusCode.NotFound)
                 return null;
 
             response.EnsureSuccessStatusCode();
@@ -79,10 +76,7 @@ CancellationToken cancellationToken
             );
 
             // 404 error indicates that the stream has mismatched content length or is not available
-            if (
-                response.StatusCode == HttpStatusCode.NotFound
-                || response.StatusCode == HttpStatusCode.Forbidden
-            )
+            if (response.StatusCode == HttpStatusCode.NotFound)
                 return null;
 
             response.EnsureSuccessStatusCode();