Fix java soong_to_convert data

soong_to_convert looks for modules with no unconverted deps, but
the list of converted modules was not being updated for java and
app prebuilts.  That meant soong_to_convert only reported modules
with no deps at all.

Test: examine soong_to_convert.txt
Change-Id: I136e6fa74153a80df5ecd767642bb2feb2ddb9dc