Use remove_const after specs which set constants #1911

Job	Run time
RuboCop	36s
specs (ubuntu, 3.1.6)	1m 36s
specs (ubuntu, 3.2.6)	1m 30s
specs (ubuntu, 3.3.7)	1m 25s
specs (ubuntu, 3.4.1)	1m 34s
specs (macos, 3.1.6)	1m 26s
specs (macos, 3.2.6)	1m 14s
specs (macos, 3.3.7)	1m 19s
specs (macos, 3.4.1)	1m 32s
specs (windows, 3.1.6)	4m 36s
specs (windows, 3.2.6)	4m 38s
specs (windows, 3.3.7)	3m 41s
specs (windows, 3.4.1)	4m 25s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 26s
	30m 58s

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