Use remove_const after specs which set constants #1912

Job	Run time
RuboCop	36s
specs (ubuntu, 3.1.6)	1m 36s
specs (ubuntu, 3.2.6)	1m 27s
specs (ubuntu, 3.3.7)	1m 24s
specs (ubuntu, 3.4.1)	1m 38s
specs (macos, 3.1.6)	1m 16s
specs (macos, 3.2.6)	1m 14s
specs (macos, 3.3.7)	1m 14s
specs (macos, 3.4.1)	1m 28s
specs (windows, 3.1.6)	4m 21s
specs (windows, 3.2.6)	3m 34s
specs (windows, 3.3.7)	3m 28s
specs (windows, 3.4.1)	5m 35s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 23s
	30m 14s

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