[offline] database is not closed if you only do partial login

[johnbotris]

to reproduce

• do offline login
• logout without going online
• see that the database hasn't been closed*

* try deleting credentials from the login screen - it will fail due to an existing database connection being open

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the database should be closed at logout with this basic chain of events:

WindowFacade.reload -> NativeSystemApp.reloadNative -> ApplicationWindow.reload -> ApplicationWindow.closeDb -> OfflineDbFacade.closeDatabaseForUser

however closeDb only calls closeDatabaseForUser when _userInfo has been set on the ApplicationWindow. This currently only happens after we complete fulll login, when we set up push identifiers (see the "getPushIdentifier" case in IPC._invokeMethod).

We need to make sure the user info is set in the native side even during partial login.

It may also be problematic to rely on the db being closed in the native part here as well, we might want to have an explicit call in the web part, since we might have to take care of this in Android and iOS too? (just a thought)

[johnbotris]

Test notes

• follow reproduction steps, it works as expected