Revert rename of .gitkeep for consistency (#6232) #17358

Job	Run time
Core Basic (18.x)	6m 14s
Core Basic - Plone 5 (18.x)	6m 27s
Core Basic (20.x)	6m 19s
Core Blocks (18.x)	8m 37s
Core Blocks - Listing (18.x)	4m 58s
Core Blocks (20.x)	8m 23s
Core Content (18.x)	3m 13s
Core Blocks - Listing (20.x)	5m 40s
Core Control Panels (18.x)	4m 12s
Core Content (20.x)	2m 58s
Core Control Panels (20.x)	4m 23s
Coresandbox (18.x)	5m 35s
Core Volto Slate (18.x)	7m 15s
Core Volto Slate (20.x)	7m 43s
Multilingual (18.x)	3m 17s
Deployment Mode (18.x)	7m 8s
Project Generator (18.x)	6m 49s
Project Generator (20.x)	6m 50s
Multilingual in Deployment Mode (18.x)	3m 27s
Working Copy (18.x)	3m 16s
	1h 52m 44s

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