Merge branch 'sub-nav-arrow' into 'develop'

SubNavigation: switch out arrow icon, enlarge it

See merge request soapbox-pub/soapbox-fe!800

app/soapbox/components/sub_navigation.js

@@ -105,7 +105,7 @@ class SubNavigation extends React.PureComponent {
             aria-label={intl.formatMessage(messages.back)}
             title={intl.formatMessage(messages.back)}
           >
-            <Icon src={require('@tabler/icons/icons/arrow-back.svg')} />
+            <Icon src={require('@tabler/icons/icons/arrow-left.svg')} />
             {intl.formatMessage(messages.back)}
           </button>
           {message && (

app/styles/navigation.scss

@@ -156,6 +156,8 @@
 
     .svg-icon {
       margin-right: 7px;
+      width: 22px;
+      height: 22px;
     }
   }