zink: correct image cap checks
PIPE_CAP_IMAGE_LOAD_FORMATTED
doesn't depend on
shaderStorageImageExtendedFormats
or
shaderStorageImageWriteWithoutFormat
.
PIPE_SHADER_CAP_MAX_SHADER_IMAGES
enables
GL_EXT_shader_image_load_store
, which does require
shaderStorageImageExtendedFormats
. Having
shaderStorageImageWriteWithoutFormat
and
shaderStorageImageReadWithoutFormat
isn't enough to support this.
It might be possible to lower extended formats to format-less reads or writes, but we don't currently do that, so we should just correct the test for now.