Remove array-api-tests prefix in ID matching

[jakevdp]

This fixes failures I'm seeing when attempting to update array-api-tests in jax-ml/jax#22903

Since the start of each skipped test name must be array_api_tests, I think this is always safe:

array-api-tests/conftest.py

Lines 159 to 161 in 31468af

	if line.startswith("array_api_tests"):
	id_ = line.strip("\n")
	skip_ids.append(id_)

[asmeurer]

I don't quite understand why you're seeing this error, although I have seen in the past that it sometimes wants to prepend some other directory to the test name. I agree just removing it after parsing should be fine.