fix(snooze): Fix react component warnings

internal_packages/thread-snooze/lib/snooze-popover-body.jsx

@@ -112,7 +112,7 @@ class SnoozePopoverBody extends Component {
         onMouseDown={this.onSnooze.bind(this, dateGenerator)}>
         <RetinaImg
           url={iconPath}
-          mode={RetinaImg.ContentIsMask} />
+          mode={RetinaImg.Mode.ContentPreserve} />
         {label}
       </div>
     )

src/components/fixed-popover.jsx

@@ -26,7 +26,7 @@ class FixedPopover extends Component {
       left: PropTypes.number,
       height: PropTypes.number,
       width: PropTypes.number,
-    }).isRequired,
+    }),
   };
 
   constructor(props) {