Avoid premature loop termination in the ITS vertexer

[shahor02]

The efficiency for the low-multiplicity ITS vertex seeds hence the ITS tracking significantly increases, the test is done on single CTF (o2_ctf_run00550369_orbit0158120896_tf0002865985_epn093.root) of LHC24af/550369

ITS seeding vertices "contributors":

Global PV contributors:

ITS tracks NClusters:

K0 yield (with global prongs only):

[github-actions]

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[mconcas]

Thanks, this looks indeed like a bug!

[shahor02]

BTW, spotted by the chatgpt codex in the vertexer adaptation by @fprino for the na60+...