vc4/ci: fix skipping of gles3 piglit tests

This is a regex, not a glob, so `spec@!opengl es 3*` matched all of
`spec@!opengl es `.

Signed-off-by: Eric Engestrom <eric@igalia.com>
Reviewed-by: Juan A. Suarez <jasuarez@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24018>

src/broadcom/ci/broadcom-rpi3-skips.txt

@@ -38,7 +38,7 @@ spec@ext_texture_env_combine@texture-env-combine
 # Versions / Extensions not supported
 spec@!opengl 3.*
 spec@!opengl 4.*
-spec@!opengl es 3*
+spec@!opengl es 3.*
 spec@arb_gpu_shader5.*
 spec@arb_gpu_shader_fp64.*
 spec@arb_gpu_shader_int64.*