refactor, miner: Delete call to UpdatePackagesForAdded at beginning of addPackageTxs

Summary:

In CreateNewBlock (in miner.cpp), inBlock is cleared before addPackageTxs, so inBlock will be empty in the first call to UpdatePackagesForAdded

Since this is the only callsite, there is no change in behavior.

Backport of core#24934.

Depends on D12954.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D12955