qml: add a few more dialog icons

electrum/gui/qml/components/ChannelDetails.qml

@@ -223,7 +223,8 @@ Pane {
                     {
                         title: qsTr('Channel Backup for %1').arg(channeldetails.short_cid),
                         text: channeldetails.channelBackup(),
-                        text_help: channeldetails.channelBackupHelpText()
+                        text_help: channeldetails.channelBackupHelpText(),
+                        iconSource: Qt.resolvedUrl('../../icons/file.png')
                     }
                 )
                 dialog.open()

electrum/gui/qml/components/CloseChannelDialog.qml

@@ -16,6 +16,7 @@ ElDialog {
 
     title: qsTr('Close Channel')
     standardButtons: closing ? 0 : Dialog.Cancel
+    iconSource: Qt.resolvedUrl('../../icons/lightning_disconnected.png')
 
     modal: true
     parent: Overlay.overlay

electrum/gui/qml/components/InvoiceDialog.qml

@@ -18,6 +18,7 @@ ElDialog {
 
     title: qsTr('Invoice')
     standardButtons: invoice_key != '' ? Dialog.Close : Dialog.Cancel
+    iconSource: Qt.resolvedUrl('../../icons/tab_send.png')
 
     padding: 0
 

electrum/gui/qml/components/ReceiveDialog.qml

@@ -24,6 +24,7 @@ ElDialog {
     parent: Overlay.overlay
     modal: true
     standardButtons: Dialog.Close
+    iconSource: Qt.resolvedUrl('../../icons/tab_receive.png')
 
     Overlay.modal: Rectangle {
         color: "#aa000000"

electrum/gui/qml/components/ServerConfigDialog.qml

@@ -60,6 +60,7 @@ ElDialog {
                 horizontalPadding: 0
                 Layout.fillHeight: true
                 Layout.fillWidth: true
+                Layout.bottomMargin: constants.paddingLarge
 
                 ListView {
                     id: serversListView