Use modern_python_path_defaults in acloud

Soong is changing the python path to be more similar
to embedded_launcher: true builds and bazel. Update
acloud to work with the new path.

Bug: 245583294
Test: atest --no-bazel-mode --host acloud_test
Change-Id: I9823ad05eae79b3125c5ee677bcac8e467ebe160