Revert "Fix problem of RepackApexPayload when using option --signing_args"

This reverts commit 5ebc4feb.

Reason for revert: This is causing the signing args to be improperly passed to apexer, treating them as if they are not specified as all.

Change-Id: Ifa0f8444a4a1871802316511b0ff0735f3350b2c
Bug: 361784913