Remove SHCTX\Software\Zotero key from registry when uninstalling.
Remove SHCTX\Software\Zotero key from registry when uninstalling.

The uninstaller walks through keys under SHCTX\Software\Zotero. It does this
in two nested loops. After deleting known child keys it deletes the parent
key provided that there are no children left.

Previously this final conditional deletion was only happening in the inner
loop. This left an empty Software\Zotero key when the uninstaller completed.

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