Fix channels first issue

[annahedstroem]

Description

• Fixing issue: Infer_channel_first called even if channel_first is set #304

Minimum acceptance criteria

• Specify what is necessary for the PR to be merged with the main branch.
• @mentions of the person that is apt to review these changes e.g., @annahedstroem

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (72a519b) 93.35% compared to head (9320a61) 93.36%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #305   +/-   ##
=======================================
  Coverage   93.35%   93.36%           
=======================================
  Files          62       62           
  Lines        3448     3450    +2     
=======================================
+ Hits         3219     3221    +2     
  Misses        229      229           

Files	Coverage Δ
quantus/functions/explanation_func.py	91.73% <100.00%> (+0.06%)	⬆️
quantus/helpers/model/tf_model.py	91.42% <ø> (ø)

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