fix: Link template choices from correct setting

[bielfrontera]

Template choices in LinkForm were being computed from the setting DJANGOCMS_LINK_TEMPLATES instead of LINK_TEMPLATE_CHOICES, that is the setting that exists on djangocms_frontend.settings

[codecov[bot]]

Codecov Report

Merging #98 (7caddb5) into master (e50fb61) will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
- Coverage   86.34%   86.32%   -0.02%     
==========================================
  Files         110      110              
  Lines        2974     2970       -4     
  Branches      321      321              
==========================================
- Hits         2568     2564       -4     
  Misses        309      309              
  Partials       97       97              

Impacted Files	Coverage Δ
djangocms_frontend/contrib/link/forms.py	82.26% <ø> (-0.49%)	:arrow_down:

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[fsbraun]

@bielfrontera Well spotted! Can you add a changelog entry? Thank you!

[bielfrontera]

@fsbraun: done. Changelog modified!

[fsbraun]

... and migrations updated! Thanks!