tee: fix -p behavior upon broken pipe stdout #6217

Job	Run time
Style/format (ubuntu-latest, feat_os_unix)	20s
Style/lint (ubuntu-latest, feat_os_unix)	1m 14s
Style/spelling (ubuntu-latest, feat_os_unix)	1m 30s
Style/toml	10s
Style/lint (macos-latest, feat_os_macos)	1m 15s
Style/lint (windows-latest, feat_os_windows)	3m 7s
	7m 36s

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