Create application bundles for widget examples on OS X

Do not remove app_bundle from CONFIG and update the Info.plist file
for the Browser example to have the correct resolution on retina
displays.
This patch also updates the snapshot sha1 to include localization
patch and one that removes a additional duplicate lower-case header
file that was causing problems during source packaging.

[ChangeLog][QtWebEngineWidgets][OS X] Fix example on retina display

Change-Id: I682d41ca13d33ec06837ad862924382f4236d76c
Task-number: QTBUG-44633
Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>