scanning: Remove Scan app from launcher

Bug: 1059779
Change-Id: I044c0326cf5393beb3d54fd586fac02b09c18468
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612442
Auto-Submit: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840833}

chrome/browser/web_applications/system_web_app_manager.cc

@@ -213,6 +213,7 @@ base::flat_map<SystemAppType, SystemAppInfo> CreateSystemWebApps(
                                     &CreateWebAppInfoForScanningSystemWebApp)));
     infos.at(SystemAppType::SCANNING).minimum_window_size = {600, 420};
     infos.at(SystemAppType::SCANNING).capture_navigations = true;
+    infos.at(SystemAppType::SCANNING).show_in_launcher = false;
   }
 
   if (SystemWebAppManager::IsAppEnabled(