skip fieldsList_e init if it already has fields (#706)

* skip fieldsList_e init if it already has fields

* different approach with clearind the list

* Update js/header_dialog.js

Co-authored-by: Mark Haslinghuis <[email protected]>

---------

Co-authored-by: nerdCopter <[email protected]>
Co-authored-by: Mark Haslinghuis <[email protected]>

Author: 3 people

js/header_dialog.js

@@ -465,7 +465,7 @@ function HeaderDialog(dialog, onSave) {
             {name: 'Unfiltered Gyroscope', description: 'Unfiltered gyro data'},
         ];
 
-        const fieldsList_e = $('.fields_list');
+        const fieldsList_e = $('.fields_list').empty();
 
         for (let i = 0; i < fields.length; i++) {
             const row_e = $(`<tr><td><label class="option"><input class="field ${i}