Styling fixes for gas customization advanced tab content.

ui/app/components/gas-customization/gas-modal-page-container/advanced-tab-content/advanced-tab-content.component.js

@@ -39,7 +39,7 @@ export default class AdvancedTabContent extends Component {
   }
 
   infoButton (onClick) {
-    return <i className="fas fa-info-circle" onClick={onClick} />
+    return <i className="fa fa-info-circle" onClick={onClick} />
   }
 
   renderDataSummary (totalFee, millisecondsRemaining) {

ui/app/components/gas-customization/gas-modal-page-container/advanced-tab-content/index.scss

@@ -3,7 +3,6 @@
 .advanced-tab {
   display: flex;
   flex-flow: column;
-  border-bottom: 1px solid $alto;
   height: 430px;
 
   &__transaction-data-summary,

ui/app/components/gas-customization/gas-modal-page-container/basic-tab-content/index.scss

@@ -2,6 +2,7 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  margin-bottom: 22px;
 
   &__title {
     margin-top: 19px;

ui/app/components/gas-customization/gas-modal-page-container/index.scss

@@ -53,6 +53,5 @@
     background: white;
     color: $dusty-gray;
     border-top: 1px solid $mischka;
-    margin-top: 22px;
   }
 }