spice: common: gdi_canvas fix gdi objects leak
spice: common: gdi_canvas fix gdi objects leak

BitmapMask was used by the draw_text function as well
therefore we need to mark from_surface = 0 if we want
it to release the boject...

(Was evil, took me few hours to understand from where
 the leak come...)

Signed-off-by: Izik Eidus <0f4d5ad8fceb71158793af13424905ac12569440@redhat.com>

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