Fix ng select in admin

client/src/app/+admin/config/edit-custom-config/edit-custom-config.component.html

@@ -924,7 +924,7 @@
 
                     <div class="form-group" [ngClass]="{ 'disabled-checkbox-extra': !isLiveEnabled() }">
                       <label i18n for="liveMaxDuration">Max live duration</label>
-                      <div class="peertube-select-container">
+                      <div>
                         <ng-select
                           labelForId="liveMaxDuration" [items]="liveMaxDurationOptions" formControlName="maxDuration"
                           bindLabel="label" bindValue="value"

client/src/app/+admin/config/edit-custom-config/edit-custom-config.component.scss

@@ -41,6 +41,10 @@ input[type=checkbox] {
   @include peertube-select-container($form-base-input-width);
 }
 
+ng-select {
+  @include ng-select($form-base-input-width);
+}
+
 my-select-checkbox {
   @include ng-select($form-base-input-width);
 }