libbinder: Fix FD handling for queued oneway RPC transactions

If a oneway transaction contained FDs and got queued, we'd drop the FDs
and then the Parcel validation would fail with an error once the
transaction was eventually processed.

Bug: 244484370
Test: m libbinder binderRpcTest && out/host/linux-x86/nativetest64/binderRpcTest/binderRpcTest
Change-Id: I781d851d875d496c8b57e3512f3f89c9911e9f3c