refactor mux path routes

legend has it that if you refactor your code enough times, one day you
will finally be happy

admin/static/releases.js

@@ -10,7 +10,7 @@ document.addEventListener('readystatechange', () => {
             headers: { "Content-Type": "application/json" },
             body: JSON.stringify({id})
         }).then(res => {
-            if (res.ok) location = "/admin/releases/" + id;
+            if (res.ok) location = "/admin/music/releases/" + id;
             else {
                 res.text().then(err => {
                     alert(err);