Ensure the signature also doesn't take the token secret into account

Author: WyriHaximus

src/RequestSigning/RequestSigner.php

@@ -76,6 +76,9 @@ public function withoutAccessToken()
         $clone->accessToken = null;
         $clone->tokenSecret = null;
 
+        $clone->signature = $clone->signature
+            ->withoutTokenSecret();
+
         return $clone;
     }