fix typo in FullNameExternalAutocomplete default value (#1196) #1953

Job	Run time
Build on windows-latest for repo global.json	13m 20s
Build on windows-latest for 6.0	13m 47s
Build on windows-latest for 7.0	18m 7s
Build on windows-latest for 8.0	17m 24s
Build on macos-latest for repo global.json	17m 21s
Build on macos-latest for 6.0	51s
Build on macos-latest for 7.0	26m 55s
Build on macos-latest for 8.0	18m 10s
Build on ubuntu-latest for repo global.json	14m 29s
Build on ubuntu-latest for 6.0	9m 45s
Build on ubuntu-latest for 7.0	10m 2s
Build on ubuntu-latest for 8.0	14m 20s
	2h 54m 31s

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