qml: add sweep icon

electrum/gui/qml/components/SweepDialog.qml

@@ -10,7 +10,7 @@ ElDialog {
     id: root
 
     title: qsTr('Sweep private keys')
-    iconSource: Qt.resolvedUrl('../../icons/add.png')
+    iconSource: Qt.resolvedUrl('../../icons/sweep.png')
 
     property bool valid: false
     property string privateKeys

electrum/gui/qml/components/WalletMainView.qml

@@ -208,7 +208,7 @@ Item {
 
         MenuItem {
             icon.color: action.enabled ? 'transparent' : Material.iconDisabledColor
-            icon.source: '../../icons/add.png'
+            icon.source: '../../icons/sweep.png'
             action: Action {
                 text: qsTr('Sweep key')
                 enabled: !Daemon.currentWallet.isWatchOnly  // watchonly might be acceptable