also exclude non thread safe GaudiHisto algs from hlt_pp_thor test

Algorithms inheriting from GaudiHistos aren't thread safe, so we also exclude lines that use algorithms which inherit from that base from the hlt_pp_thor throughput test.
An example class which has this problem is e.g. the ParticleMassMonitor

should fix the occasional segfault in the throughput test (cc @rmatev)

This only results in 2 additional lines being excluded from this test.

cc @mvesteri @poluekt