[App Management] Hide System web apps and show Web Apps.

Fixes a bug that did not show the correct web apps in App Management
when BMO is turned on.

Fixed: 1064877
Change-Id: I38dcd7485c59cd6b9a821b15b14f04c08e7590bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147127Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759118}

chrome/browser/apps/app_service/web_apps.cc

@@ -541,7 +541,7 @@ void WebApps::SetShowInFields(apps::mojom::AppPtr& app,
   app->show_in_launcher = show;
   app->show_in_search = show;
   app->show_in_management =
-      web_app->IsSystemApp() ? show : apps::mojom::OptionalBool::kFalse;
+      web_app->IsSystemApp() ? apps::mojom::OptionalBool::kFalse : show;
 }
 
 void WebApps::PopulatePermissions(const web_app::WebApp* web_app,