Visualization should set random shuffle to false

[remtav]

https://github.com/NRCan/geo-deep-learning/blob/develop/train_segmentation.py#L114

The visualization tool is designed to let user see outputs of model as it is being trained and see the evolution of the predictions on the same samples epoch after epoch. When used on validation dataset (what is most frequently done), then this dataset should not be shuffled as the dataloader will therefore not be loading the samples in the same order during validation loop.

When validation is not used, then shuffle should be set to True