[ENH] save one output per subject (Sourcery refactored)

[sourcery-ai]

Pull Request #26 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
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[sourcery-ai]

Function config refactored with the following changes:

• Inline variable that is immediately returned (inline-immediately-returned-variable)

[sourcery-ai]

Function get_deepmreye_filename refactored with the following changes:

• Inline variable that is immediately returned (inline-immediately-returned-variable)

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.39%.

Quality metrics	Before	After	Change
Complexity	2.02 ⭐	2.04 ⭐	0.02 👎
Method Length	34.10 ⭐	33.50 ⭐	-0.60 👍
Working memory	5.60 ⭐	5.50 ⭐	-0.10 👍
Quality	85.74% ⭐	86.13% ⭐	0.39% 👍

Other metrics	Before	After	Change
Lines	149	145	-4

Changed files	Quality Before	Quality After	Quality Change
bidsmreye/utils.py	85.74% ⭐	86.13% ⭐	0.39% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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