material ui v4 migration style fixes for add token list

src/routes/safe/components/Balances/Tokens/screens/TokenList/index.jsx

@@ -158,7 +158,7 @@ class Tokens extends React.Component<Props, State> {
 
             return (
               <ListItem key={token.address} className={classes.token}>
-                <ListItemIcon>
+                <ListItemIcon className={classes.tokenIcon}>
                   <Img src={token.logoUri} height={28} alt={token.name} onError={setImageToPlaceholder} />
                 </ListItemIcon>
                 <ListItemText primary={token.symbol} secondary={token.name} />

src/routes/safe/components/Balances/Tokens/screens/TokenList/style.js

@@ -47,6 +47,9 @@ export const styles = () => ({
       letterSpacing: '-0.5px',
     },
   },
+  tokenIcon: {
+    marginRight: md,
+  },
   progressContainer: {
     width: '100%',
     height: '100%',