COMPATIBILITY: Support tag-group-chooser interface && add base CSS to wizard app

assets/javascripts/discourse/templates/components/wizard-custom-field.hbs

@@ -216,7 +216,9 @@
 
     <div class="setting-value">
       {{tag-group-chooser
+        id=(concat field.id "-tag-groups")
         tagGroups=field.tag_groups
+        onChange=(action (mut field.tag_groups))
       }}
     </div>
   </div>

assets/stylesheets/wizard/wizard_custom.scss

@@ -1,5 +1,6 @@
 @import "common/foundation/colors";
 @import "common/foundation/variables";
+@import "common/foundation/base";
 @import "common/base/code_highlighting";
 @import "common/base/modal";
 @import "common/base/onebox";