jack: only update buffer_size/srate when active

As long as we are inactive, don't update our internal buffer_size or
sample rate. This way, when we become active, we will emit the right
callback with the right value instead of doing nothing.

Fixes crashes in Carla.

pipewire-jack/src/pipewire-jack.c

@@ -748,7 +748,8 @@ void jack_get_version(int *major_ptr, int *minor_ptr, int *micro_ptr, int *proto
 			pthread_mutex_unlock(&c->rt_lock);	\
 		pw_thread_loop_lock(c->context.loop);		\
 	} else {						\
-		(expr);						\
+		if (c->active)					\
+			(expr);					\
 		pw_log_debug("skip " #callback 			\
 			" cb:%p active:%d", c->callback,	\
 			c->active);				\