Remove shift-base:net-processing from ubsan suppressions
Summary:
D12344 removed the unneeded shift, so we can remove the corresponding suppression.
This concludes backport of core#23970
Test Plan:
With UBSAN:
ninja all check check-functional
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D13538