[show-gpus] Fix catalog API call for cudo compute

[Michaelvll]

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: bash tests/backward_comaptibility_tests.sh

[concretevitamin]

We may want a sky show-gpus unit test to ensure it's runnable?

[Michaelvll]

We may want a sky show-gpus unit test to ensure it's runnable?

This is caught by the test of list_accelerators, but GitHub failed to catch the merge issue, and did not run the test with the master branch merged for that PR. A possible test flow for our future PR merging should be always trying to merge the master branch and test the tests locally (except for the smoke tests).