Trigger "changeDirectory" even on URL change

When using the browser back button or clicking on sections on the left
sidebar (like favorites), the "changeDirectory" jQuery event did not get
called, so apps like recommendations would not notice the directory
change.

This fixes the issue by also setting changeUrl to true when the file
list's directory got changed as a result from a URL change.

Added optional changedThroughUrl argument to make sure the event
recipient knows if the change was done through a URL change and make it
possible prevent a loop in the onDirectoryChange handler that actually
changes the URL when the origin was already from a URL change.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>