part: update window title whenever the URL changes
This fixes a small regression in commit 20c09f3c. A ReadOnlyPart emits `completed()` if `openUrl()` returns true, so we lost a call to `setFileNameFromArchive()`. We fix that by connecting this slot to the `urlChanged()` signal. Tested by opening some archive and then an header-encrypted archive, and making sure the window title had the name of the second archive while the password dialog was open.
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