Remove double greyed-out-overlay

Summary:
When a toggled section is frozen, it already has a greyed out overlay over the whole thing.
So there's no need for another one covering the indented section.

Reviewed By: passy

Differential Revision: D18063767

fbshipit-source-id: a4d5992ecf61f036a23f619e9cf64d59150a41d6

src/chrome/settings/ToggledSection.tsx

@@ -43,7 +43,7 @@ export default function ToggledSection(props: {
       </FlexRow>
       <IndentedSection>
         {props.children}
-        {props.toggled ? null : <GreyedOutOverlay />}
+        {props.toggled || props.frozen ? null : <GreyedOutOverlay />}
       </IndentedSection>
     </FlexColumn>
   );