qml: cleanup prev commit, add default icons to MessageDialog, add question icon

electrum/gui/qml/components/MessageDialog.qml

@@ -8,6 +8,9 @@ import "controls"
 ElDialog {
     id: dialog
     title: qsTr("Message")
+    iconSource: yesno
+        ? Qt.resolvedUrl('../../icons/question.png')
+        : Qt.resolvedUrl('../../icons/info.png')
 
     property bool yesno: false
     property alias text: message.text

electrum/gui/qml/components/Preferences.qml

@@ -245,10 +245,6 @@ Pane {
                         text: qsTr('Lightning')
                     }
 
-                    Label {
-                        text: qsTr('Lightning Routing')
-                    }
-
                     RowLayout {
                         Layout.columnSpan: 2
                         Layout.fillWidth: true
@@ -260,7 +256,7 @@ Pane {
                                 if (activeFocus) {
                                     if (!checked) {
                                         var dialog = app.messageDialog.createObject(app, {
-                                            text: qsTr('Using plain gossip mode is not recommended. Are you sure?'),
+                                            text: qsTr('Using plain gossip mode is not recommended on mobile. Are you sure?'),
                                             yesno: true
                                         })
                                         dialog.yesClicked.connect(function() {