Move kotlin stdlib after javac jars

A future CL is going to treat local jars separately from dependency
jars.  Rearrange the order of the kotlin standard library jars to
come after the local jars produced by javac, which will better match
the future ordering and ease ninja file comparisions.

Bug: 308016794
Test: all soong tests pass
Flag: EXEMPT refactor
Change-Id: I9ed6a649350451bf1788077752db5222f50c0247