Always use alternate sceen on alt-d #3891

Job	Run time
lint	12s
Debug compatibility test	6m 0s
ruby-versions / Generate Ruby versions	4s
rake test 2.7 (latest reline)	1m 34s
vterm-yamatanooroti 2.7 (latest reline)	1m 24s
rake test 2.7	1m 31s
vterm-yamatanooroti 2.7	1m 39s
rake test 3.0 (latest reline)	1m 26s
vterm-yamatanooroti 3.0 (latest reline)	53s
rake test 3.0	1m 26s
vterm-yamatanooroti 3.0	1m 0s
rake test 3.1 (latest reline)	1m 26s
vterm-yamatanooroti 3.1 (latest reline)	55s
rake test 3.1	1m 27s
vterm-yamatanooroti 3.1	1m 14s
rake test 3.2 (latest reline)	1m 24s
vterm-yamatanooroti 3.2 (latest reline)	55s
rake test 3.2	1m 23s
vterm-yamatanooroti 3.2	1m 40s
rake test 3.3 (latest reline)	1m 36s
vterm-yamatanooroti 3.3 (latest reline)	1m 10s
rake test 3.3	1m 26s
vterm-yamatanooroti 3.3	53s
rake test head (latest reline)	1m 34s
vterm-yamatanooroti head (latest reline)	59s
rake test head	1m 39s
vterm-yamatanooroti head	1m 2s
rake test truffleruby-head (latest reline)	2m 49s
rake test truffleruby-head	2m 42s
	43m 23s

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