Fix .column-back-button line-height (#8074)

app/javascript/styles/mastodon/components.scss

@@ -2011,6 +2011,7 @@ a.account__display-name {
   cursor: pointer;
   flex: 0 0 auto;
   font-size: 16px;
+  line-height: inherit;
   border: 0;
   text-align: unset;
   padding: 15px;