separate path with comma

Co-Authored-By: dkanada <dkanada@users.noreply.github.com>

MediaBrowser.WebDashboard/Api/DashboardService.cs

@@ -150,7 +150,7 @@ namespace MediaBrowser.WebDashboard.Api
                     return _serverConfigurationManager.Configuration.DashboardSourcePath;
                 }
 
-                return Path.Combine(_serverConfigurationManager.ApplicationPaths.ApplicationResourcesPath, "jellyfin-web/src");
+                return Path.Combine(_serverConfigurationManager.ApplicationPaths.ApplicationResourcesPath, "jellyfin-web", "src");
             }
         }