rdv: change entrypoint for calendar css + correct calendar controls as a function of context

src/Bundle/ChillCalendarBundle/Resources/public/vuejs/_components/CalendarUserSelector/CalendarUserSelector.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="calendar__controls">
+  <div>
      <h2 class="chill-red">{{ $t('choose_your_calendar_user') }}</h2>
     <VueMultiselect
         name="field"
@@ -201,12 +201,3 @@ export default {
 
 <style src="vue-multiselect/dist/vue-multiselect.css"></style>
 
-<style lang="scss" scoped>
-  div.calendar__controls {
-    background-color: 'black';
-    height: 50%;
-    display: flex;
-    flex-direction: column;
-    justify-content: flex-end;
-  }
-</style>