fix import

Author: sharhio

sass/_main.scss

@@ -51,7 +51,7 @@ $body-font-weight: $font-weight-medium;
 @import '../app/component/from-map-modal';
 @import '../app/component/app-bar-hsl';
 @import '../app/component/itinerary/itinerary';
-@import '../app/component/Snackbar';
+@import '../app/component/snackbar';
 @import '../app/component/itinerary/customize-search';
 @import '../app/component/itinerary/search-settings-dropdown';
 @import '../app/component/itinerary/itinerary-summary';