Visualization: Do not increment latency on write

The latency should not be incremented when writing sample data to the
buffer, but rather be posted by the output.

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

Audio/Visualization/VisualizationController.swift

@@ -73,7 +73,6 @@ class VisualizationController : NSObject {
 				j += 1; if j >= k { j = 0 }
 			}
 			self.visAudioCursor = j
-			self.latency += Double(amount) / self.sampleRate
 			self.visSamplesPosted += UInt64(amount);
 		}
 	}