examples/texteditor: remove use of Material style

Amend ec582ef0b9 which removed use of Material
as the default style. This cause example to fail when cross-compiled, as it
then used different qml file which had dependency to Material style.

Fixes: QTBUG-106557
Pick-to: 6.4 6.3 6.2
Change-Id: I7f918363a47c801a6755eca38c1c4bc4da2854b6
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

examples/quickcontrols2/texteditor/qml/+touch/texteditor.qml

@@ -102,9 +102,6 @@ ApplicationWindow {
     footer: ToolBar {
         visible: !textArea.readOnly && textArea.activeFocus
 
-        Material.primary: "#E0E0E0"
-        Material.elevation: 0
-
         Flickable {
             anchors.fill: parent
             contentWidth: toolRow.implicitWidth