Fix transformed painting of QStaticText in GL2 paint engine

The GL2 paint engine was rewritten to use GL to transform glyphs when
copying them from the glyph cache instead of keeping a separate cache
for different transformations. Since the glyph positions in QStaticText
already include the transformation, we need to run the gl calls with
an identity matrix, otherwise the position of the glyphs will be
transformed twice. The output from drawText() and drawStaticText()
will for the same reason look different for the two different engines.

The option here is to detect the problem when drawing to the opengl2
engine, and then recalculating the glyph positions for the QStaticText.
This will of course create a big overhead when regularly switching
between different paint devices, but it might make sense to optimize
for one QStaticText per paint device. For the time being I haven't
done that, though, since that change would require a bigger hack, so
it warrants deeper consideration.

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