Wavelet dbwavf refactor

[victor1234]

• simplify code
• remove second parameter

[codecov-commenter]

Codecov Report

Merging #317 (fed3f1b) into master (ed3508b) will decrease coverage by 0.03%.
The diff coverage is 96.75%.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
- Coverage   86.81%   86.78%   -0.04%     
==========================================
  Files          49       49              
  Lines        4126     4116      -10     
==========================================
- Hits         3582     3572      -10     
  Misses        544      544              

Impacted Files	Coverage Δ
modules/transform/wavelet.cpp	96.49% <96.75%> (-0.10%)	⬇️

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