zink: fix direct image mapping offset
the x and y offsets here were improperly calculated without taking into account:
- layer/level offset
- x/y coord bpp
Fixes: 8d46e35d ("zink: introduce opengl over vulkan")
the x and y offsets here were improperly calculated without taking into account:
Fixes: 8d46e35d ("zink: introduce opengl over vulkan")