Always use alternate sceen on alt-d #3934

Job	Run time
Debug compatibility test	5m 59s
lint	13s
ruby-versions / Generate Ruby versions	8s
vterm-yamatanooroti 2.7 (latest reline)	1m 4s
rake test 2.7 (latest reline)	1m 35s
rake test 2.7	1m 34s
rake test 3.0 (latest reline)	1m 30s
rake test 3.0	1m 24s
rake test 3.1 (latest reline)	1m 30s
rake test 3.1	1m 29s
rake test 3.2 (latest reline)	1m 27s
vterm-yamatanooroti 2.7	1m 10s
rake test 3.2	1m 42s
vterm-yamatanooroti 3.0 (latest reline)	52s
rake test 3.3 (latest reline)	1m 30s
rake test 3.3	1m 25s
vterm-yamatanooroti 3.0	1m 0s
rake test head (latest reline)	1m 38s
vterm-yamatanooroti 3.1 (latest reline)	57s
rake test head	1m 35s
vterm-yamatanooroti 3.1	1m 7s
rake test truffleruby-head (latest reline)	2m 48s
vterm-yamatanooroti 3.2 (latest reline)	51s
rake test truffleruby-head	2m 53s
vterm-yamatanooroti 3.2	1m 1s
vterm-yamatanooroti 3.3 (latest reline)	59s
vterm-yamatanooroti 3.3	57s
vterm-yamatanooroti head (latest reline)	55s
vterm-yamatanooroti head	1m 12s
	42m 25s

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