Simplify sdk_snapshot module member list generation

When generating the list of members the names of the resolved
modules are used in the case of java_libs and stubs_source whereas
the name stored in the nativeLibInfo is used for native_shared_libs.

Those names are identical to the names provided in the corresponding
sdk property so this switches to use those instead as it is more
consistent and simplifies future refactorings.

Bug: 143678475
Test: m nothing
Change-Id: I9c08a8175fa9a37bb0cd89a361ef4c0f613b0dab