Update power-select.hbs for searchFieldPosition support

Field searchFieldPosition was added to ember-power-select in cibernox/ember-power-select#1864.

Author: yeehaw1990-2

addon/components/bs-form/element/control/power-select.hbs

@@ -43,6 +43,7 @@
     @scrollTo={{@scrollTo}}
     @search={{@search}}
     @searchEnabled={{@searchEnabled}}
+    @searchFieldPosition={{@searchFieldPosition}}
     @searchField={{if (has-block) @searchField (if @searchField @searchField @optionLabelPath)}}
     @searchMessage={{@searchMessage}}
     @searchPlaceholder={{@searchPlaceholder}}
@@ -68,4 +69,4 @@
       {{/if}}
     {{/if}}
   </PowerSelect>
-{{/let}}
+{{/let}}