routers: Minor code cleanup in UsernameSubRoute

The `reloadParam` function already calls `context.UserAssignmentWeb`
with the same parameters, there's no need to do it again.

Change cherry picked from gitea#29751.

Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>

routers/web/user/home.go

@@ -743,7 +743,6 @@ func UsernameSubRoute(ctx *context.Context) {
 			return
 		}
 		if reloadParam(".rss") {
-			context.UserAssignmentWeb()(ctx)
 			feed.ShowUserFeedRSS(ctx)
 		}
 	case strings.HasSuffix(username, ".atom"):