perf intel-pt: Fix transactions_sample_type

'transactions_sample_type' is needed to correctly inject transactions
samples but it was not being set. Set it from the event sample type.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1495786658-18063-18-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/intel-pt.c

@@ -2035,6 +2035,7 @@ static int intel_pt_synth_events(struct intel_pt *pt,
 			return err;
 		}
 		pt->sample_transactions = true;
+		pt->transactions_sample_type = attr.sample_type;
 		pt->transactions_id = id;
 		id += 1;
 		evlist__for_each_entry(evlist, evsel) {