Remove padding of info circle of advanced gas (MetaMask#7810)

Author: tmashuang

ui/app/components/app/gas-customization/advanced-gas-inputs/index.scss

@@ -20,10 +20,9 @@
       @media screen and (max-width: 576px) {
         font-size: 10px;
       }
-      
+
       .fa-info-circle {
         color: $silver;
-        margin-left: 10px;
         cursor: pointer;
       }