Don't show "Show more/less" menu option in the sidebar if no more plugins are available

Summary: When all the plugins are selected, "Show more/less" menu option in the sidebar should not be shown

Reviewed By: passy

Differential Revision: D19164369

fbshipit-source-id: 50bec130e80c14aea2b4565e7659409d879e585c

src/chrome/mainsidebar/MainSidebar.tsx

@@ -328,6 +328,7 @@ class MainSidebar extends PureComponent<Props, State> {
               onFavorite,
             )}
             <ListItem>
+              {favoritePlugins.length === allPlugins.length ? null : (
                 <SidebarButton
                   small
                   compact
@@ -346,6 +347,7 @@ class MainSidebar extends PureComponent<Props, State> {
                     }}
                   />
                 </SidebarButton>
+              )}
             </ListItem>
           </>
         )}