gui: Fix unintialized WalletView::progressDialog
gui: Fix unintialized WalletView::progressDialog

Former-commit-id: e1b2142c4c1f146e763e6d098c68087be79e6a9e
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin