Fix loading property import

Imported loading from wrong mixin with commit
https://gerrit.openbmc-project.xyz/c/openbmc/webui-vue/+/38917

This will fix warning:
"export 'loading' was not found in '@/components/Mixins/LocalTimezoneLabelMixin'

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I10869d605f70bde0b4cdcb970c96357f9a5da87a
diff --git a/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue b/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
index 6e8c967..9be70b8 100644
--- a/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
+++ b/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
@@ -209,10 +209,8 @@
 import PageSection from '@/components/Global/PageSection';
 
 import BVToastMixin from '@/components/Mixins/BVToastMixin';
-import LoadingBarMixin from '@/components/Mixins/LoadingBarMixin';
-import LocalTimezoneLabelMixin, {
-  loading,
-} from '@/components/Mixins/LocalTimezoneLabelMixin';
+import LoadingBarMixin, { loading } from '@/components/Mixins/LoadingBarMixin';
+import LocalTimezoneLabelMixin from '@/components/Mixins/LocalTimezoneLabelMixin';
 import VuelidateMixin from '@/components/Mixins/VuelidateMixin.js';
 
 import { mapState } from 'vuex';