Updates to wfFindFile again

[D-Groenewegen]

No need to support the older method wfFindFile (pre-MW 1.34). Since SRF 4.0.x, the minimum version is MW 1.35. Also corrected an earlier oversight.
#778

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 40.79%. Comparing base (c0dd4bb) to head (394f5f6).
Report is 25 commits behind head on master.

Files	Patch %	Lines
formats/dygraphs/SRF_Dygraphs.php	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #838      +/-   ##
============================================
+ Coverage     40.12%   40.79%   +0.66%     
- Complexity     2332     2404      +72     
============================================
  Files            78       81       +3     
  Lines          8247     7852     -395     
============================================
- Hits           3309     3203     -106     
+ Misses         4938     4649     -289     

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[alexander-gesinn]

Thanks for your PR! We need to explain the CI and testing a little bit better :-) We now have Docker Compose based CI that can be used for testing locally by simply running "make ci". See https://github.com/gesinn-it-pub/docker-compose-ci