Datatables fix template on ajax navigation

[thomas-topway-it]

• fixes [datatables] Column templates work initially but are no longer applied after filtering the table or navigating through the tablepages if limit is set #860
• provides a more robust expandTemplate method

[codecov]

Codecov Report

Attention: Patch coverage is 7.89474% with 35 lines in your changes missing coverage. Please review.

Project coverage is 45.39%. Comparing base (4782e36) to head (303475d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
formats/datatables/DataTables.php	7.89%	35 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #931      +/-   ##
============================================
- Coverage     45.55%   45.39%   -0.16%     
- Complexity     2318     2326       +8     
============================================
  Files            80       80              
  Lines          9044     9078      +34     
============================================
+ Hits           4120     4121       +1     
- Misses         4924     4957      +33     

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