[devicelock] Fix lockcode postition

src/qml/DeviceLock.qml

@@ -6,17 +6,16 @@ import QtQuick.Layouts 1.0
 
 Item {
     id: root
-    anchors.top: clock.bottom
-    anchors.bottom: parent.bottom
-    anchors.left: parent.left
-    anchors.right: parent.right
+
     ColumnLayout {
         anchors.fill: parent
         spacing: 40
+
         TextField {
             id: lockCodeField
             readOnly: true
             echoMode: TextInput.PasswordEchoOnEdit
+            anchors.horizontalCenter: parent.horizontalCenter
         }
 
         GridLayout {

src/qml/Lockscreen.qml

@@ -15,7 +15,13 @@ Image {
     }
     DeviceLock {
         id: deviceLockUI
-        anchors.fill: parent
+        anchors {
+            top: clock.bottom
+            left: parent.left
+        }
+
+        height: parent.height-clock.height
+
         visible: deviceLock.state === 1
         z: 201
     }