remove underline from std NU_LOG_FORMAT (#10604) #61

Job	Run time
fmt-clippy (windows-latest, default)	10m 34s
plugins (windows-latest)	4m 18s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	7m 12s
fmt-clippy (windows-latest, extra)	6m 41s
plugins (macos-latest)	3m 12s
std-lib-and-python-virtualenv (macos-latest, py)	6m 40s
fmt-clippy (macos-latest, default)	8m 44s
plugins (ubuntu-20.04)	4m 4s
tests (windows-latest, default)	11m 50s
std-lib-and-python-virtualenv (windows-latest, py)	12m 21s
fmt-clippy (macos-latest, extra)	7m 15s
tests (macos-latest, default)	8m 3s
fmt-clippy (ubuntu-20.04, default)	4m 24s
tests (ubuntu-20.04, default)	6m 19s
fmt-clippy (ubuntu-20.04, dataframe)	4m 37s
tests (ubuntu-20.04, dataframe)	11m 12s
fmt-clippy (ubuntu-20.04, extra)	4m 32s
tests (ubuntu-20.04, extra)	7m 25s
	2h 9m 23s

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