frontend/forms: Fix duplicate UI element name warning

horizontalLayout_5 was already used further up.

frontend/forms/OBSPermissions.ui

@@ -410,7 +410,7 @@
             </widget>
            </item>
            <item row="9" column="1">
-            <layout class="QHBoxLayout" name="horizontalLayout_5">
+            <layout class="QHBoxLayout" name="horizontalLayout_6">
              <property name="sizeConstraint">
               <enum>QLayout::SetDefaultConstraint</enum>
              </property>