glsl: fix buffer texture type
Fixes: 3ace6b96 ("compiler/types: Add a texture type") Signed-off-by:Karol Herbst <kherbst@redhat.com> Reviewed-by:
Jesse Natalie <jenatali@microsoft.com> Reviewed-by:
Jason Ekstrand <jason.ekstrand@collabora.com> Part-of: <mesa/mesa!19381> (cherry picked from commit 87526f79)