Fix --diagnostics-file parsing

[codykaup]

I would appear if you pass anything to --diagnostics-file, it doesn't do anything and just writes to the default location.

This happens because

1. We're using defaultIfSet instead of defaultUnlessSetOrFalse when parsing that option
2. Our || operation was actually getting parsed as:

(defaultIfSet(flags.diagnosticsFile, DEFAULT_DIAGNOSTICS_FILE) || flags.diagnostics)
        ? DEFAULT_DIAGNOSTICS_FILE
        : undefined,

So if you set --diagnostics-file or --diagnostics, we'll always use the default file location.

📦 Published PR as canary version: 11.16.5--canary.1116.11667959497.0

✨ Test out this PR locally via:

npm install chromatic@11.16.5--canary.1116.11667959497.0
# or 
yarn add chromatic@11.16.5--canary.1116.11667959497.0

[github-actions]

📦 Package Size: 5380 KB
✅ Compared to main: 0 KB db3848b (5380 KB)

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Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 100.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (db3848b)	7116	4839	68.00%
Head commit (d66dee9)	7114 (-2)	4838 (-1)	68.01% (+0.01%)

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1116)	2	2	100.00%

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[chromatic-ci-bot]

🚀 PR was released in v11.16.4 🚀