Workaround to the 'bug'/feature whereby closing an opened wallet window doesnt actually close the wallet.  This caused enqueued tx notifications to continue to appear after a wallet window was closed, which is unexpected behavior from a user's perspective.  This commit fixes that.
Workaround to the 'bug'/feature whereby closing an opened wallet window doesnt actually close the wallet.  This caused enqueued tx notifications to continue to appear after a wallet window was closed, which is unexpected behavior from a user's perspective.  This commit fixes that.

fyookball/electrum,fyookball/electrum,fyookball/electrum