qt icons: update remaining QIcon() constructors

follow-up #5053

electrum/gui/qt/transaction_dialog.py

@@ -140,7 +140,7 @@ class TxDialog(QDialog, MessageBoxMixin):
         b.setDefault(True)
 
         self.qr_button = b = QPushButton()
-        b.setIcon(QIcon(qr_icon))
+        b.setIcon(read_QIcon(qr_icon))
         b.clicked.connect(self.show_qr)
 
         self.copy_button = CopyButton(lambda: str(self.tx), parent.app)

electrum/plugins/hw_wallet/qt.py

@@ -200,7 +200,7 @@ class QtPluginBase(object):
                 return
             tooltip = self.device + '\n' + (keystore.label or 'unnamed')
             cb = partial(self.show_settings_dialog, window, keystore)
-            button = StatusBarButton(QIcon(self.icon_unpaired), tooltip, cb)
+            button = StatusBarButton(read_QIcon(self.icon_unpaired), tooltip, cb)
             button.icon_paired = self.icon_paired
             button.icon_unpaired = self.icon_unpaired
             window.statusBar().addPermanentWidget(button)