trace: update unimportant_prefixes

The version built on muninn does not have the leading
'tracepoint_base::log_backtrace(trace_record*, unsigned char*&)'
frame.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

scripts/osv/prof.py

@@ -82,6 +82,10 @@ unimportant_prefixes = [
      'log',
      'trace_slow_path',
      'operator()'),
+
+    ('log',
+     'trace_slow_path',
+     'operator()'),
 ]
 
 bottom_of_stack = set(['thread_main', 'thread_main_c'])