Remove redundant import statement in SCSS (#5864)

* Remove redudant import statement in SCSS

* Fix wrong chmod

app/javascript/styles/mastodon/components.scss

@@ -1,5 +1,3 @@
-@import 'variables';
-
 .app-body {
   -webkit-overflow-scrolling: touch;
   -ms-overflow-style: -ms-autohiding-scrollbar;