rename fill attribute

Summary:
We were using `fill={true}` as an attribute to make flexbox containers fill the entire available space.

However, `fill` is an HTML attribute (see: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/fill) This caused warnings printed to the console.

This diff renames the attribute to `grow` with is also more in line with the Flexbox terminology.

Reviewed By: priteshrnandgaonkar

Differential Revision: D10488389

fbshipit-source-id: ed8553c6203cdf6df94d26c731164ecec4c9fbd2

src/ui/components/VirtualList.js

@@ -126,7 +126,7 @@ export default class VirtualList extends Component<
 
     return (
       <View
-        fill={true}
+        grow={true}
         onScroll={this.handleScroll}
         innerRef={this.setRef}
         scrollable={true}>