Fix/Workaround #34854: render buffer update writes to wrong layer

Was caused by recent change in image_buffer_rect_update which
was writing data to ibuf-rect_float. Apparently, this buffer
could point to different render layer than came from RenderResult.

Made quick fix for this, which ends up in skipping float buffer
update in image_buffer_rect_update and skipping GLSL when image
has both byte and float buffers.

This will bring speed down a bit, but slower blender is better
than broken blender.

Proper fix will arrive later this week.

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