misc: cleanup unused variables and comments

pages/Receive.qml

@@ -73,10 +73,6 @@ Rectangle {
         anchors.right: parent.right
 
         spacing: 20
-        property int labelWidth: 120
-        property int editWidth: 400
-        property int lineEditFontSize: 12
-        property int qrCodeSize: 220
 
         ColumnLayout {
             id: addressRow

pages/Transfer.qml

@@ -53,7 +53,6 @@ Rectangle {
     property string warningContent: ""
     property string sendButtonWarning: ""
     property string startLinkText: qsTr("<style type='text/css'>a {text-decoration: none; color: #FF6C3C; font-size: 14px;}</style><font size='2'> (</font><a href='#'>Start daemon</a><font size='2'>)</font>") + translationManager.emptyString
-    property bool showAdvanced: false
     property bool warningLongPidDescription: descriptionLine.text.match(/^[0-9a-f]{64}$/i)
 
     Clipboard { id: clipboard }

pages/settings/SettingsNode.qml

@@ -50,10 +50,6 @@ Rectangle{
         anchors.right: parent.right
 
         spacing: 0
-        property int labelWidth: 120
-        property int editWidth: 400
-        property int lineEditFontSize: 14
-        property int buttonWidth: 110
 
         Rectangle {
             Layout.fillWidth: true