Fix coverage report paths

[AlexVCaron]

Quick description

Paths between the source, the coverage report and codecov were muddled. I moved .coverage at the root, and now codecov can execute there and everything is golden.

Type of change

Check the relevant options.

• Bug fix (non-breaking change which fixes an issue)

Provide data, screenshots, command line to test (if relevant)

...

Checklist

• My code follows the style guidelines of this project (run autopep8)
• I added relevant citations to scripts, modules and functions docstrings and descriptions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I moved all functions from the script file (except the argparser and main) to scilpy modules
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (89ca33f) 0.00% compared to head (543d1c2) 65.95%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #907       +/-   ##
===========================================
+ Coverage    0.00%   65.95%   +65.95%     
===========================================
  Files         384      383        -1     
  Lines       21352    21345        -7     
  Branches     3495     3494        -1     
===========================================
+ Hits            0    14078    +14078     
+ Misses      21352     5660    -15692     
- Partials        0     1607     +1607     

Components	Coverage Δ
Scripts	67.37% <ø> (+67.37%)	⬆️
Library	63.37% <ø> (+63.37%)	⬆️