Removes the use of IQueryString from ConfigurePluginAsync() (#302)

Resolves: #301

Author: jterry75

src/Docker.DotNet/Endpoints/PluginOperations.cs

@@ -178,9 +178,8 @@ public async Task<Plugin> InspectPluginAsync(string name, CancellationToken canc
                 throw new ArgumentNullException(nameof(parameters.Args));
             }
 
-            var query = new QueryString<PluginConfigureParameters>(parameters);
             var body = new JsonRequestContent<IList<string>>(parameters.Args, this._client.JsonSerializer);
-            return this._client.MakeRequestAsync(new[] { NoSuchPluginHandler }, HttpMethod.Post, $"plugins/{name}/set", query, cancellationToken);
+            return this._client.MakeRequestAsync(new[] { NoSuchPluginHandler }, HttpMethod.Post, $"plugins/{name}/set", null, body, cancellationToken);
         }
     }
 }