qml: drop unused last property from Setting

Author: promag

src/qml/components/ConnectionSettings.qml

@@ -64,7 +64,6 @@ ColumnLayout {
     Separator { Layout.fillWidth: true }
     Setting {
         id: gotoProxy
-        last: true
         Layout.fillWidth: true
         header: qsTr("Proxy settings")
         actionItem: CaretRightButton {

src/qml/controls/Setting.qml

@@ -10,7 +10,6 @@ import org.bitcoincore.qt 1.0
 
 AbstractButton {
     id: root
-    property bool last: parent && root === parent.children[parent.children.length - 1]
     required property string header
     property alias actionItem: action_loader.sourceComponent
     property alias loadedItem: action_loader.item