Use binding 0 for atomic counter buffers

Use binding 0 for atomic counter buffers

GLES3.1 has a minimum requirement of one atomic counter buffer binding.
The following tests were binding atomic counter buffers to bindings 1
and 2 respectively:

  dEQP-GLES31.functional.atomic_counter.*
  dEQP-GLES31.functional.synchronization.inter_call.without_memory_barrier.*atomic_counter*

This makes the tests fail on implementations that support the minimum
required number of bindings.

VK-GL-CTS github issue: 156

Change-Id: I512478626b592c38e74150c83617176380f27c3d