Bugfix: Side-effects in qdf_to_ticker_df() util.

[Magnus167]

qdf_to_ticker_df() was missing df = df.copy()

[codecov]

Codecov Report

Merging #1112 (7575b7d) into develop (8277203) will decrease coverage by 0.07%.
Report is 19 commits behind head on develop.
The diff coverage is 71.05%.

❗ Current head 7575b7d differs from pull request most recent head 8a70b20. Consider uploading reports for the commit 8a70b20 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1112      +/-   ##
===========================================
- Coverage    64.84%   64.78%   -0.07%     
===========================================
  Files           51       51              
  Lines         5291     5299       +8     
===========================================
+ Hits          3431     3433       +2     
- Misses        1860     1866       +6     

Files	Coverage Δ
macrosynergy/management/types.py	100.00% <100.00%> (ø)
macrosynergy/visuals/plotter.py	94.31% <100.00%> (ø)
macrosynergy/management/decorators.py	75.96% <42.85%> (ø)
macrosynergy/management/utils.py	88.58% <75.00%> (-2.46%)	⬇️