fix: Get rid of deprecation warning on settings submenus

Switch to new handlebars helper selectOptions as foundry has deprecated the
select helper in V12.  This one is simpler too.

static/templates/menu.hbs

@@ -6,11 +6,7 @@
             <div class="form-fields">
                 {{#if setting.isSelect}}
                     <select name="{{setting.key}}">
-                        {{#select setting.value}}
-                            {{#each setting.choices as |label value|}}
-                                <option value="{{value}}">{{localize label}}</option>
-                            {{/each}}
-                        {{/select}}
+                        {{selectOptions setting.choices selected=setting.value}}
                     </select>
                 {{else if setting.isCheckbox}}
                     <input type="checkbox" name="{{setting.key}}" {{checked setting.value}} />