AddressBook: add missing key property to list items.

Well actually just remove the useless div, but the driver was
to add the missing key prop.

src/components/AddressBook.tsx

@@ -50,6 +50,7 @@ function getContactColor(contact: ContactType) {
 
 const AddressBookItem = React.memo((_props: any) => {
   const {
+    style,
     entry,
     onClick,
   } = _props;
@@ -57,6 +58,7 @@ const AddressBookItem = React.memo((_props: any) => {
 
   return (
     <ListItem
+      style={style}
       leftIcon={
         <Avatar style={{ backgroundColor: getContactColor(entry) }}>
           {name && name[0] && name[0].toUpperCase()}
@@ -104,13 +106,12 @@ class AddressBook extends React.PureComponent<PropsType> {
               rowHeight={56}
               rowRenderer={({ index, key, style }) => {
                 return (
-                  <div style={style}>
                   <AddressBookItem
                     key={key}
+                    style={style}
                     entry={entries[index]}
                     onClick={this.props.onItemClick}
                   />
-                  </div>
                 );
               }}
             />