Remove flags that enable the new python path behavior

The new behavior has been enabled by default, and these
flags aren't necessary anymore.

Fixes: 245583294
Test: m py_dont_import_folder_of_entrypoint_test && /ssd/aosp-master/out/host/linux-x86/testcases/py_dont_import_folder_of_entrypoint_test/x86_64/py_dont_import_folder_of_entrypoint_test
Change-Id: I5b6f98da51791bc5d28662ef799a10c1bb6a35a0