style(wiki): use core.js

apps/wiki/tf-id-picker.js

@@ -26,7 +26,8 @@ class TfIdentityPickerElement extends LitElement {
 
 	render() {
 		return html`
-			<select @change=${this.changed} style="max-width: 100%">
+			<link rel="stylesheet" href="core.css"/>
+			<select @change=${this.changed} class="button" style="max-width: 100%">
 				${(this.ids ?? []).map(id => html`<option ?selected=${id == this.selected} value=${id}>${id}</option>`)}
 			</select>
 		`;