[Visualization] Add micro bias to cylinder scale

Apparently, old macOS wants to divide something by the scale size, so
setting it to zero causes division by zero errors? Let's set it to a
really small number instead.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Visualization/SpectrumView.m

@@ -345,7 +345,7 @@ extern NSString *CogPlaybackDidStopNotficiation;
 		SCNNode *dotNode = nodes[i + 1 + 11];
 		SCNVector3 position = node.position;
 		position.y = maxValue * 0.5;
-		node.scale = SCNVector3Make(1.0, maxValue, 1.0);
+		node.scale = SCNVector3Make(1.0, maxValue + 1e-7, 1.0);
 		node.position = position;
 
 		position = dotNode.position;