[ENHANCEMENT] Update RUN_uncor to write tracks to output/tracks

### Relation

The script, `RUN_uncor` and `RUN_terminal` are good and simple script to introduce users to the encounter model classes and how to generate model samples or tracks derived from samples. This functionality existed in the previous default example scripts, `RUN_1_emsample` and `RUN_2_sample2track` and functions, `em_sample` and `sample2track`. Issues #35 and #36 will develop the functionality to write samples and tracks to file.

### Description

Using the functionality created by issues #35 and #36, update `RUN_uncor` to write tracks to the default directory of output/tracks.