chore(aurelia): small UI fix to have custom select full width

Author: ghiscoding

demos/aurelia/src/examples/slickgrid/example26.scss

@@ -0,0 +1,3 @@
+filter-select {
+  width: 100%;
+}

demos/aurelia/src/examples/slickgrid/example26.ts

@@ -19,6 +19,7 @@ import { CustomAureliaViewModelFilter } from './custom-aureliaViewModelFilter.js
 import { CustomTitleFormatter } from './custom-title-formatter.js';
 import { EditorSelect } from './editor-select.js';
 import { FilterSelect } from './filter-select.js';
+import './example26.scss';
 
 const NB_ITEMS = 100;