troubleshooter: properly fix deadlock (#395)

## Description of change
Finally figured out where the deadlock was coming from - it's because
the `dump_to_logger` was writing `SuperstepSound: Audio device is not
available` to the logger which calls back into the log hook, and then
emits another deferred message, trying to acquire the lock again on the
same stack.

## Testing
Tested the superstep sound failure case again.

src/spice2x/util/deferlog.h

@@ -10,5 +10,5 @@ namespace deferredlogs {
     extern const std::initializer_list<std::string> SUPERSTEP_SOUND_ERROR_MESSAGE;
 
     void defer_error_messages(std::initializer_list<std::string> messages);
-    void dump_to_logger();
+    void dump_to_logger(bool is_crash=false);
 }