tests/compute: set writable properties to output resources
tests/compute: set writable properties to output resources

This is currently working because the std430 layout forces a switch to
SSBO. Before previous commit, setting them to std140 would have failed
because UBOs are not writable. The switch to std140 is to make sure this
doesn't break again in the future.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl