st/nine: Remove useless code in nine_shader
st/nine: Remove useless code in nine_shader

Since 1604efa6fda9b780e8537a131ad77f3e83e5a67a,
lconsti and lconstb don't need to be initialized.

Remove some leftovers from the previous code (which
has now invalid use of ARRAY_SIZE on a pointer instead
of an array).

Reported by Coverity.

Signed-off-by: Axel Davy <2b6ef604b998fb81662f85c329e4fc020eae8e5d@ens.fr>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler