Ignore owner property when computing java_sdk_library dist subdirectory

The owner property is no longer used, the dist subdirectory is determined
by the dist_group property.

Bug: 186723288
Test: TestJavaSdkLibraryDist
Change-Id: Id6d997eef05f6511070677974219674f248cb754
Merged-In: Id6d997eef05f6511070677974219674f248cb754
(cherry picked from commit 59b92bfd)