tests/gl_basic_test: s/GBM/SURFACELESS_EGL/ typo
tests/gl_basic_test: s/GBM/SURFACELESS_EGL/ typo

Fixes: 19a126d ("tests/gl_basic_test: Support platform surfaceless_egl")
Signed-off-by: Alexey Brodkin <1fa739873496c8c0c1b521f2061ee5fa4a0306e8@synopsys.com>
[emil: split from larger patch]
Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

waffle-gl/waffle,waffle-gl/waffle,waffle-gl/waffle,waffle-gl/waffle