FIX: use native javascript instead of jquery

assets/javascripts/discourse/controllers/admin-wizards-manager.js.es6

@@ -68,7 +68,7 @@ export default Controller.extend({
       file: null,
       filename: null,
     });
-    $("#file-upload").val("");
+    document.getElementById('custom-wizard-file-upload').value = '';
   },
 
   @observes("importing", "destroying")
@@ -83,7 +83,7 @@ export default Controller.extend({
 
   actions: {
     upload() {
-      $("#file-upload").click();
+      document.getElementById('custom-wizard-file-upload').click();
     },
 
     clearFile() {
@@ -102,7 +102,7 @@ export default Controller.extend({
       if (maxFileSize < file.size) {
         this.setMessage("error", "file_size_error");
         this.set("file", null);
-        $("#file-upload").val("");
+        document.getElementById('custom-wizard-file-upload').value = '';
       } else {
         this.setProperties({
           file,

assets/javascripts/discourse/templates/admin-wizards-manager.hbs

@@ -11,11 +11,11 @@
       </div>
     {{/if}}
 
-    <Input
-      id="file-upload"
-      @type="file"
+    {{input
+      id="custom-wizard-file-upload"
+      type="file"
       accept="application/json"
-      {{on "input" (action "setFile" value="target.value")}} />
+      input=(action "setFile")}}
     {{d-button
       id="upload-button"
       label="admin.wizard.manager.upload"

assets/stylesheets/common/wizard-manager.scss

@@ -26,7 +26,7 @@
     }
   }
 
-  #file-upload {
+  #custom-wizard-file-upload {
     display: none;
   }