Make test_neighbours pass.

theano/sandbox/gpuarray/neighbours.py

@@ -460,7 +460,7 @@ class GpuImages2Neibs(GpuKernelBase, Images2Neibs, Op):
 
 
 @op_lifter([Images2Neibs])
-def use_gpu_images2neibs(node):
+def use_gpu_images2neibs(node, context_name):
     if node.op.mode in ['valid', 'ignore_borders', 'wrap_centered']:
         return GpuImages2Neibs(node.op.mode)