Bug fix on sniffer (PerfExpert 4.1.1)

There was an bug in the sniffer code which tested for one and used the
other. This bug was passed unnoticed because of the PAPI mappings. Now
the mapping is not available anymore, the bug came up.

Details: PAPI 5.2 had some event names mapping which were removed in
version PAPI 5.3 These mappings affected the floating pointer counters,
more specifically the FP_COMP_OPS_EXE.SSE_FP_SCALAR_SINGLE. In other
words, the mapping from FP_COMP_OPS_EXE.SSE_FP_SCALAR to
FP_COMP_OPS_EXE.SSE_FP_SCALAR_SINGLE was removed.

Thanks to Kenneth Hoste from UGent (Belgium).