Import sass helpers to LoaderBar component

Fixes errors when trying to access Sass variables in LoaderBar
component.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I9aa4baa2c1725a62bdbad36a5bda342563090b0a
diff --git a/src/components/Global/LoadingBar.vue b/src/components/Global/LoadingBar.vue
index 1d8d68a..d972b86 100644
--- a/src/components/Global/LoadingBar.vue
+++ b/src/components/Global/LoadingBar.vue
@@ -69,6 +69,8 @@
 </script>
 
 <style lang="scss" scoped>
+@import 'src/assets/styles/helpers';
+
 .progress {
   position: absolute;
   left: 0;