Remove duplicate author and date display in Twenty Nineteen #12486

Job	Run time
Core running from build / Core running from build / Linux	2m 7s
Core running from src / Core running from src / Linux	1m 59s
Core running from build / Core running from build / Windows	3m 23s
Core running from src / Core running from src / Windows	3m 31s
Core running from build / Core running from build / MacOS	1m 47s
Core running from src / Core running from src / MacOS	1m 44s
Gutenberg running from build / Gutenberg running from build / Linux	8m 29s
Gutenberg running from src / Gutenberg running from src / Linux	8m 46s
Gutenberg running from build / Gutenberg running from build / Windows	12m 40s
Gutenberg running from src / Gutenberg running from src / Windows	11m 2s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 45s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 40s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 11m 53s

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