Fix time filtering transpose issue

[tyler-a-cox]

Fixes the time filtering transpose issue when using regularization.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5c8c10f) 98.96% compared to head (a5bd36e) 98.96%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #18   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files           4        4           
  Lines        1738     1747    +9     
=======================================
+ Hits         1720     1729    +9     
  Misses         18       18           

Flag	Coverage Δ
unittests	98.96% <100.00%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
hera_filters/dspec.py	98.18% <100.00%> (+<0.01%)	⬆️
hera_filters/tests/test_dspec.py	100.00% <100.00%> (ø)

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