glsl: fix is_integer_16_32

This shouldn't check for 64-bit...

Fixes: a052a9c2777 ("glsl: handle int16 and uint16 types and add instructions for mediump")
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10125>
1 file changed