Use implementation jar in IDEInfo

headerJar and implementationJar have the same classes and methods, but
using implemetnationJar ensures that the jar is present in the
intermediates directory after an `m $module` run.

Bug: 384956156
Test: m android-support-fragment-nodeps out/soong/module_bp_java_deps.json
Test: cat out/soong/module_bp_java_deps.json | jq
'"android-support-fragment-nodeps"'
Test: verified that the jar reported by the above command exists

Test: m nothing --no-skip-soong-tests
Change-Id: Ibd70c455b6bf12958b8f55d6c46ff2553a2f9d84