Add version gate to strHdrType field

[oddstr13]

The strHdrType field is new to Kodi 20.
Fixes #852

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
1.9% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 21.50%. Comparing base (bc8cae9) to head (842729b).
Report is 1 commits behind head on master.

Files	Patch %	Lines
jellyfin_kodi/objects/kodi/kodi.py	14.28%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #854   +/-   ##
=======================================
  Coverage   21.50%   21.50%           
=======================================
  Files          63       63           
  Lines        8623     8629    +6     
  Branches     1587     1589    +2     
=======================================
+ Hits         1854     1856    +2     
- Misses       6745     6749    +4     
  Partials       24       24           

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