Fix indent style tabs -> spaces

[sierrafoxtrot]

Even simple pushes should run the pipeline. In this case a tab indent line crept into a test script. Lesson learned.

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ BASH	bash-exec	223		3	0.64s
✅ BASH	shellcheck	223		0	12.46s
✅ BASH	shfmt	223		0	0.04s
⚠️ CPP	cpplint	365		5784	14.27s
✅ EDITORCONFIG	editorconfig-checker	783		0	3.9s
⚠️ HTML	djlint	4		734	3.86s
⚠️ HTML	htmlhint	4		106	0.41s
✅ MARKDOWN	markdownlint	1		0	0.54s
✅ MARKDOWN	markdown-link-check	1		0	0.79s
✅ MARKDOWN	markdown-table-formatter	1		0	0.3s
✅ REPOSITORY	gitleaks	yes		no	0.95s
✅ REPOSITORY	git_diff	yes		no	0.05s
✅ REPOSITORY	secretlint	yes		no	5.83s
✅ SPELL	cspell	784		0	31.86s
✅ SPELL	misspell	782		0	0.53s
✅ YAML	prettier	7		0	1.01s
✅ YAML	v8r	7		0	6.4s
✅ YAML	yamllint	7		0	0.34s

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