Removed unused imports in print monitor

resources/qml/PrintMonitor.qml

@@ -2,8 +2,6 @@
 // Cura is released under the terms of the LGPLv3 or higher.
 
 import QtQuick 2.7
-import QtQuick.Controls 1.1
-import QtQuick.Controls.Styles 1.1
 import QtQuick.Layouts 1.1
 
 import UM 1.2 as UM