Bug 1467111 - Add the responsiveness feature to the default feature list r=mstange

Bug 1447338 introduced the new feature for responsiveness handling, but
we forgot to include it in the default feature list. As a result it's
not included by default when profiling the startup.

MozReview-Commit-ID: 1YPcDaGZR9s

--HG--
extra : rebase_source : 421bbda28b3c7170c4dc3f676f57844483528276

tools/profiler/core/platform.cpp

@@ -2464,6 +2464,7 @@ profiler_init(void* aStackTop)
                       ProfilerFeature::StackWalk |
 #endif
                       ProfilerFeature::Threads |
+                      ProfilerFeature::Responsiveness |
                       0;
 
   UniquePtr<char[]> filterStorage;