Small fixes in: FSL ground truth and UpdateExampleReadmes.py script

This pull request include:
- Some fixes in the FSL and SPM ground truth for example 001. Those updates are needed in order for the tests to be computed at [incf-nidash/nidm-results_fsl](https://github.com/incf-nidash/nidm-results_fsl) and [incf-nidash/nidm-results_spm](https://github.com/incf-nidash/nidm-results_spm).
- In `UpdateExampleReadmes.py` script, each example file is now compared to the Prov Store document linked in the corresponding README (instead of the last document with the same title on the ProvStore).