incorrect event for ComboBox in samba4's swat.module.ldbbrowse

[John Jorgensen]

I think that in Samba4's
webapps/swat/source/class/swat/module/ldbbrowse/, the dbFile button
should be associated with the  "changeSelected" event instead of
"changeSelection" (qx.ui.treevirtual.TreeVirtual uses
"changeSelection", but qx.ui.form.ComboBox uses "changeSelected").

I've attached a patch, but it includes some unrelated changes to
comments (made as I tried to understand the code), which might be
incorrect.
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