CONTRIB: Fixed typo in env var for cuda_hooks gtest.

contrib/test_jenkins.sh

@@ -878,7 +878,7 @@ run_malloc_hook_gtest() {
 
  echo "==== Running cuda hooks with far jump, $compiler_name compiler ===="
  $TIMEOUT env \
- UCM_BISTRO_FORCE_FAR_JUMP=y \
+ UCX_MEM_BISTRO_FORCE_FAR_JUMP=y \
  GTEST_FILTER='cuda_hooks.*' \
  make -C test/gtest test
 }