TextEditor: Remove byte order mark.

Some compilers have problems with such control characters.

Change-Id: I137913f8c7f8bd83367c3e5dbad4018045eff28f
Reviewed-on: http://codereview.qt.nokia.com/4240


Reviewed-by: Maurice Kalinowski <maurice.kalinowski@nokia.com>
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>