Fix subcommand/choices completion in bash

[brentyi]

1. The choices list was formerly not being expanded correctly.
2. Removing local IFS=$'\\n' fixed some issues as well. Wasn't totally following why this was needed.

[sourcery-ai[bot]]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	47.11 ⛔	47.11 ⛔	0.00
Method Length	136.70 😞	136.70 😞	0.00
Working memory	1.67 ⭐	1.67 ⭐	0.00
Quality	25.93% 😞	25.93% 😞	0.00%

Other metrics	Before	After	Change
Lines	763	764	1

Changed files	Quality Before	Quality After	Quality Change
shtab/init.py	25.93% 😞	25.93% 😞	0.00%

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
shtab/init.py	get_bash_commands	78 ⛔	589 ⛔		1.22% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_zsh	62 ⛔	909 ⛔		2.38% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_tcsh	53 ⛔	470 ⛔		4.99% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_bash	2 ⭐	106 🙂	11 😞	64.30% 🙂	Extract out complex expressions
shtab/init.py	add_argument_to	4 ⭐	89 🙂	11 😞	64.67% 🙂	Extract out complex expressions

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• 🙂 good
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• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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[codecov-commenter]

Codecov Report

Base: 74.46% // Head: 74.46% // No change to project coverage :thumbsup:

Coverage data is based on head (9bfda44) compared to base (13de419). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #106 +/- ## ======================================= Coverage 74.46% 74.46% ======================================= Files 2 2 Lines 47 47 ======================================= Hits 35 35 Misses 12 12 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative)

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[casperdcl]

/tag v1.5.6 f8203d9

[brentyi]

Thanks @casperdcl!!

[NiklasReisser]

Ah, unsetting IFS in between did the trick! Thanks for fixing this!

[casperdcl]

Yep was unreasonably hard to figure out. Can't tell what's worse about shells - the language itself, or the (lack of) good documentation. 🤺😅