Have art/build/apex/runtests.sh's check for libjavacrypto in Runtime APEX.

Also remove a supernumerary `libjavacrypto` occurrence from
build/apex/Android.bp.

Test: art/build/apex/runtests.sh
Bug: 113373927
Bug: 121395847
Change-Id: Ia909ad90afbc806cc7263cf3318c5c3e59be2acb