glsl: Avoid calling get_array_element for scalar constants

Accessing scalar constant as an array in function call or
initializer list triggered assert in get_array_element.
Examples:
   func(0[0]);
   vec2 t = { 0[0], 0 };

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107550

Signed-off-by: Danylo Piliaiev <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>

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