"Draw locks" option can be heavy on the UI

I run tracy in a project where mutexes are being created and destroyed frequently. This leads tracy's UI to slow down badly if the "Draw locks" option is enabled and the app has been running for a couple of minutes. "Draw locks" is enabled by default and the state is not stored between runs. I'm locally running a build of tracy that has the option default to off.

It'd be nice if this selection was stored, but of course the nicest thing would be if the UI didn't slow down while "Draw locks" is enabled.

The slow down can be tested by creating and destroying a bunch of locks in a loop in the profiled application.