isl/state: Use a valid alignment for 1-D textures
isl/state: Use a valid alignment for 1-D textures

The alignment we use doesn't matter (see the comment) but it should at
least be an alignment we can represent with the enums.

Reviewed-by: Topi Pohjolainen <749697f19798b7f640b17221fd283b903825f071@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler