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util/framebuffer: fix util_framebuffer_get_num_layers

Mike Blumenkrantz requested to merge zmike/mesa:fb-layer into main

the existing methodology was to use the maximum number of layers for all the attachments, but this was broken if the number of layers wasn't equivalent for all attachments

instead, use the smallest number of layers for all the attachments so that attachments with fewer layers don't have oob layer access

cc: mesa-stable

affects: KHR-GL46.geometry_shader.layered_rendering_boundary_condition.layered_rendering_boundary_condition_various_textures

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