Correct setting the RemoteView's provider id.

This seems to interfere with cross profile remote views otherwise. This
will also avoid changing the stored RemoteViews, or not providing an ID
if the RemoteViews is constructed by the host.

Fix: 187837525
Fix: 187867661
Test: atest ManagedProfileCrossProfileTest#testCrossProfileWidgets
Test: Manually with other apps, checking the colors do no flickr
Test: Check that uninstalling an app with a widget doesn't crash anymore
Change-Id: I7caa3f58d9b554e36f54e6b9d3b793c3ae5023ef