fix(upload): add missing return

internal/server/http.go

@@ -16,6 +16,7 @@ func PrepareHTTP() {
 	registerAuthorized("/svg/", func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != "POST" {
 			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
 		}
 		routes.CreateSVG(w, *r)
 	})