tu: remove spurious viewport assert
vulkan spec has no such restrictions on the y coordinate or height
cc: mesa-stable
fixes (zink): spec@!opengl 3.0@viewport-clamp spec@arb_viewport_array@render-viewport
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vulkan spec has no such restrictions on the y coordinate or height
cc: mesa-stable
fixes (zink): spec@!opengl 3.0@viewport-clamp spec@arb_viewport_array@render-viewport