Fix Initial Indentation of Blocks in Nomultiline Mode #2460

Job	Run time
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	58s
rake test 2.7	1m 10s
rake test 3.0 (latest reline)	55s
rake test 3.0	42s
rake test 3.1 (latest reline)	44s
rake test 3.1	41s
rake test 3.2 (latest reline)	55s
rake test 3.2	42s
rake test head (latest reline)	47s
rake test head	1m 3s
rake test truffleruby-head (latest reline)	5m 23s
rake test truffleruby-head	5m 29s
vterm-yamatanooroti 2.7 (latest reline)	1m 13s
vterm-yamatanooroti 2.7	1m 17s
vterm-yamatanooroti 3.0 (latest reline)	42s
vterm-yamatanooroti 3.0	41s
vterm-yamatanooroti 3.1 (latest reline)	49s
vterm-yamatanooroti 3.1	1m 3s
vterm-yamatanooroti 3.2 (latest reline)	1m 12s
vterm-yamatanooroti 3.2	43s
vterm-yamatanooroti head (latest reline)	51s
vterm-yamatanooroti head	51s
	28m 53s

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