Various DFF Fixes

[mikejhuang]

Addresses ticket https://github.com/AllenInstitute/ophys_etl_pipelines/issues/537

1. Change kernel mode from constant to reflect
2. Update baseline calculation such that median filter is only applied over "inactive frames"
3. Remove detrending

[codecov[bot]]

Codecov Report

Merging #552 (a45c54f) into main (c9d61f8) will decrease coverage by 1.37%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #552      +/-   ##
==========================================
- Coverage   97.66%   96.29%   -1.37%     
==========================================
  Files         101      101              
  Lines        8040     8053      +13     
  Branches      764      764              
==========================================
- Hits         7852     7755      -97     
- Misses        109      219     +110     
  Partials       79       79              

Flag	Coverage Δ
event_detection_tests	?
general_tests	96.29% <100.00%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/modules/dff/test_dff.py	97.43% <100.00%> (+0.66%)	:arrow_up:
tests/utils/test_traces.py	100.00% <100.00%> (ø)
tests/modules/event_detection/conftest.py	28.00% <0.00%> (-72.00%)	:arrow_down:
...es/event_detection/test_event_detection_schemas.py	30.35% <0.00%> (-69.65%)	:arrow_down:
...ts/modules/event_detection/test_event_detection.py	30.90% <0.00%> (-69.10%)	:arrow_down:
...ules/event_detection/test_event_detection_utils.py	37.50% <0.00%> (-62.50%)	:arrow_down: