code_style: remove unused code

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Models/Remote.cs

@@ -97,7 +97,6 @@ public bool TryGetCreatePullRequestURL(out string url, string mergeBranch)
 
             var uri = new Uri(baseURL);
             var host = uri.Host;
-            var route = uri.AbsolutePath.TrimStart('/');
             var encodedBranch = HttpUtility.UrlEncode(mergeBranch);
 
             if (host.Contains("github.com", StringComparison.Ordinal))