fix(legacy): allow updating track types code (#2955)

Since moving to an indexed track_type model for 3.0, the constraint of the code being immutable is no longer
valid, since it's not used as index anymore. This commit removes the readonly flag from that form field.

legacy/application/assets.json

@@ -87,7 +87,7 @@
   "js/airtime/showbuilder/main_builder.js": "d1ea3c3d834e47cd35c27efd75516190",
   "js/airtime/showbuilder/tabs.js": "a0b5284afde950a6f32c7e9e75550690",
   "js/airtime/status/status.js": "41456c6ed40f820e1e99215e81eb4bc4",
-  "js/airtime/tracktype/tracktype.js": "cca00731e212727908bec54f21d4be58",
+  "js/airtime/tracktype/tracktype.js": "1d11ec7ba6a79bc7a3cde1f167f4dc6e",
   "js/airtime/user/user.js": "28811eb65c17bc9954900daeaed6c1ad",
   "js/airtime/utilities/utilities.js": "e5d83eea1b38d2ff19bb968d30af9c98",
   "js/airtime/widgets/table-example.js": "77d448b6496adf5be0a360640cd3980c",

legacy/public/js/airtime/tracktype/tracktype.js

@@ -15,12 +15,6 @@ function populateForm(entries) {
   $("#visibility").val(visibility_value);
 
   $("#analyze_cue_points").prop("checked", entries.analyze_cue_points);
-
-  if (entries.id.length != 0) {
-    $("#code").attr("readonly", "readonly");
-  } else {
-    $("#code").removeAttr("readonly");
-  }
 }
 
 function rowClickCallback(row_id) {