[BUG] Added detected rpeaks to ecg_process

[rostro36]

Description

This PR fixes #602 . It makes such that the detected RPeaks get added to ecg_quality.

Runs in docs/examples/bio_custom/bio_custom.ipynb. May have to adapt tests.

Proposed Changes

• rpeaks["ECG_R_Peaks"] is used instead of None for ecq_quality.
• Some automatic formatting

Checklist

• [x] I have read the CONTRIBUTING file.
• [x] My PR is targetted at the dev branch (and not towards the master branch).
• [x] I ran the CODE CHECKS on the files I added or modified and fixed the errors.
• [ ] I have added the newly added features to News.rst (if applicable)

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[DominiqueMakowski]

Good catch! will merge once it passes the checks