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/plugins/leak_canary/index.js

@@ -147,14 +147,14 @@ export default class LeakCanary extends FlipperPlugin<State> {
 
     return (
       <Sidebar position="right" width={600} minWidth={300} maxWidth={900}>
-        <Panel heading={'Instance'} floating={false} fill={false}>
+        <Panel heading={'Instance'} floating={false} grow={false}>
           <ManagedDataInspector
             data={instanceFields}
             expandRoot={true}
             extractValue={this._extractValue}
           />
         </Panel>
-        <Panel heading={'Static'} floating={false} fill={false}>
+        <Panel heading={'Static'} floating={false} grow={false}>
           <ManagedDataInspector
             data={staticFields}
             expandRoot={true}
@@ -171,8 +171,8 @@ export default class LeakCanary extends FlipperPlugin<State> {
 
     return (
       <Window>
-        <FlexColumn fill={true}>
-          <FlexColumn fill={true} scrollable={true}>
+        <FlexColumn grow={true}>
+          <FlexColumn grow={true} scrollable={true}>
             {this.state.leaks.map((leak: Leak, idx: number) => {
               const elements = showFullClassPaths
                 ? leak.elements