glsl: reject samplers not declared as uniform/function params earlier

This improves consistency with image variables and atomic
counters which are already rejected the same way.

Note that opaque variables can't be treated as l-values, which
means only the 'in' function parameter is allowed.

v2: rewrite commit message

Signed-off-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Timothy Arceri <[email protected]> (v1)
Reviewed-by: Marek Olšák <[email protected]> (v2)

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