ftrace: Fix compile error on fuzzing targets

Add a missing argument required for creating a
FtraceDataSourceConfig causing compile failures.

This was missed when submitting
15a82e9bd8ee993ae1c735a00818ec7adb5afcdf.

Change-Id: Idb35cd8e897f8c61f809543fc9ee4e4aa9e572e1
diff --git a/src/traced/probes/ftrace/cpu_reader_fuzzer.cc b/src/traced/probes/ftrace/cpu_reader_fuzzer.cc
index 52a986d..76908c9 100644
--- a/src/traced/probes/ftrace/cpu_reader_fuzzer.cc
+++ b/src/traced/probes/ftrace/cpu_reader_fuzzer.cc
@@ -61,7 +61,8 @@
                                    {},
                                    {},
                                    /*symbolize_ksyms=*/false,
-                                   /*preserve_ftrace_buffer=*/false};
+                                   /*preserve_ftrace_buffer=*/false,
+                                   {}};
   ds_config.event_filter.AddEnabledEvent(
       table->EventToFtraceId(GroupAndName("sched", "sched_switch")));
   ds_config.event_filter.AddEnabledEvent(