lint - remove unit on zero values

opentech/static_src/src/sass/apply/components/_link.scss

@@ -123,7 +123,7 @@
     &--to-top {
         position: fixed;
         right: 20px;
-        bottom: 0px;
+        bottom: 0;
         display: flex;
         align-items: center;
         flex-direction: column;