Small view for performance module

The performance module in the Control Bar doesn't have a small or medium style. However, this would be easy to realize. On the one hand, the CPU bars could be made a bit smaller (4 pixels instead of 6). On the other hand, the HD and memory bars could be vertical instead of horizontal. The latter could even be removed completely, considering that a computer made for a DAW is not too likely to run out of memory or disk space nowadays.