Enable nixd in nix-ts-mode too #5322

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 21s
test (ubuntu-latest, 28.2, false)	2m 40s
test (ubuntu-latest, 29.4, false)	2m 28s
test (macos-latest, 28.2, false)	3m 39s
test (macos-latest, 29.4, false)	3m 36s
test (windows-latest, 27.2, false)	2m 27s
test (windows-latest, 28.2, false)	3m 6s
test (windows-latest, 29.4, false)	2m 46s
test (ubuntu-latest, snapshot, true)	1m 27s
test (macos-latest, snapshot, true)	2m 42s
test (windows-latest, snapshot, true)	45s
	27m 57s

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