Delete helpers import on DateTimeSettings SFC

Importing helper Sass files is no longer necessary in SFCs because it
is included by the sass loader. It could potentially also cause
issues with theming if it is included because SFC styles would override
the env partial.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: Ie865c63bdf9a10480242177b4dabe0895edc79f1
diff --git a/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue b/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
index 008feff..2e3fc19 100644
--- a/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
+++ b/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
@@ -359,8 +359,6 @@
 </script>
 
 <style lang="scss" scoped>
-@import 'src/assets/styles/helpers';
-
 .b-form-datepicker {
   position: absolute;
   right: 0;