qml: change title of ConfirmTxDialog

From a user perspectuve, what they are asked to do is select the mining fee.

electrum/gui/qml/components/ConfirmTxDialog.qml

@@ -17,7 +17,7 @@ ElDialog {
     property alias amountLabelText: amountLabel.text
     property alias sendButtonText: sendButton.text
 
-    title: qsTr('Confirm Transaction')
+    title: qsTr('Transaction Fee')
 
     // copy these to finalizer
     onAddressChanged: finalizer.address = address

electrum/gui/qml/components/OpenChannelDialog.qml

@@ -200,7 +200,6 @@ ElDialog {
     Component {
         id: confirmOpenChannelDialog
         ConfirmTxDialog {
-            title: qsTr('Confirm Open Channel')
             amountLabelText: qsTr('Channel capacity')
             sendButtonText: qsTr('Open Channel')
             finalizer: channelopener.finalizer