Fix the open Preference issue on MacOS #595
Open
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This PR fixes the NS_ERROR_NOT_AVAILABLE issue from #581
MacOS can use Command + W to close Zotero Window but not close the Zotero.
Then MacOS can open Zotero again which redraw ZoteroPane.
However, Zotfile is already existed, so it will not be recreated.
the window variable inside Zotfile now point to the old window not current one.
always get the main window such that Zotfile can still open Preference when MacOS reopen Zotero.