Bugfix : View Timelines, single CID charts legend

[Magnus167]

Test using :
pip install git+https://github.com/macrosynergy/macrosynergy@bugfix/vt_single_cid.

Closes #820

[codecov]

Codecov Report

Patch coverage: 61.90% and no project coverage change.

Comparison is base (555bb9f) 73.65% compared to head (5032123) 73.66%.

❗ Current head 5032123 differs from pull request most recent head fdc6643. Consider uploading reports for the commit fdc6643 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #844   +/-   ##
========================================
  Coverage    73.65%   73.66%           
========================================
  Files           31       31           
  Lines         3792     3797    +5     
========================================
+ Hits          2793     2797    +4     
- Misses         999     1000    +1     

Impacted Files	Coverage Δ
macrosynergy/download/dataquery.py	71.77% <33.33%> (-0.71%)	⬇️
macrosynergy/management/check_availability.py	47.54% <33.33%> (+0.98%)	⬆️
macrosynergy/panel/view_timelines.py	91.66% <100.00%> (+0.59%)	⬆️

... and 1 file with indirect coverage changes

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