increase contrast for links in inverted colors table #17757

Job	Run time
Core Basic (18.x)	6m 44s
Core Basic (20.x)	6m 27s
Core Basic - Plone 5 (18.x)	6m 37s
Core Blocks (18.x)	8m 37s
Core Blocks (20.x)	8m 42s
Core Blocks - Listing (18.x)	5m 15s
Core Content (18.x)	2m 58s
Core Blocks - Listing (20.x)	4m 55s
Core Content (20.x)	2m 59s
Core Control Panels (18.x)	4m 8s
Coresandbox (18.x)	6m 54s
Core Volto Slate (18.x)	6m 58s
Core Control Panels (20.x)	4m 18s
Deployment Mode (18.x)	6m 35s
Core Volto Slate (20.x)	6m 56s
Project Generator (18.x)	6m 58s
Project Generator (20.x)	6m 39s
Multilingual (18.x)	3m 26s
Multilingual in Deployment Mode (18.x)	3m 43s
Working Copy (18.x)	3m 42s
	1h 53m 31s

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