fix broken icons after FA upgrade

src/components/mention_link/mention_link.scss

@@ -65,7 +65,6 @@
       color: var(--link);
       opacity: 0.8;
       display: inline-block;
-      height: 50%;
       line-height: 1;
       padding: 0 0.1em;
       vertical-align: -25%;

src/components/select/select.vue

@@ -51,6 +51,7 @@
     bottom: 0;
     right: 5px;
     height: 100%;
+    width: 0.875em;
     color: $fallback--text;
     color: var(--inputText, $fallback--text);
     line-height: 28px;