Coding Standards: Replace redundant check in `wpmu_validate_blog_sign… #517

Job	Run time
Determine Matrix	-1s
${{ matrix.multisite && 'Multisite' \|\| 'Single Site' }} ${{ matrix.memcached && 'Memcached' \|\| 'Default' }}	0s
Slack Notifications	0s
matrix.label	0s
Failed workflow tasks	0s
	-1s

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