remove superfluous ANGLE code from Qt.gui module template

The QtAngle include is already added by inspecting the qt_lib_gui.pri
file of the Qt build directory, and for Qt4 it is irrelevant.

Change-Id: I8441b7f26921f6285ba698ef57dd5ca746d9cbbe
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>