workflow-multiplicities.sh: adjusting default ITS multiplicity cuts for PbPb

[ehellbar]

No description provided.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[ehellbar]

we set defaults twice, once here and once in https://github.com/AliceO2Group/AliceO2/blob/9ad6dd4b29fdf5749b138ac8bf4ea62c49405378/prodtests/full-system-test/dpl-workflow.sh#L179.

I changed it last year in dpl-workflow.sh, but just noticed that it is still overridden by workflow-multiplicities.sh.