Fixed wrong datatype for frame duration

CubeControl/Frame.java

 						return;
 					}
 					durationSlider.setValue(Integer.parseInt(frameLengthText.getText()));
-					worker.getAnimation(animList.getSelectedIndex()).getFrame(frameList.getSelectedIndex()).setTime((byte)(Integer.parseInt(frameLengthText.getText())));
+					worker.getAnimation(animList.getSelectedIndex()).getFrame(frameList.getSelectedIndex()).setTime((short)(Integer.parseInt(frameLengthText.getText())));
 				}
 			}
 		});