Expand Regexp.quote spec to cover dollar sign characters #1733

Job	Run time
RuboCop	26s
specs (ubuntu, 3.0.6)	1m 28s
specs (ubuntu, 3.1.4)	1m 29s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 26s
specs (macos, 3.0.6)	1m 36s
specs (macos, 3.1.4)	1m 18s
specs (macos, 3.2.2)	1m 25s
specs (macos, 3.3.0)	1m 25s
specs (windows, 3.0.6)	4m 49s
specs (windows, 3.1.4)	5m 34s
specs (windows, 3.2.2)	4m 40s
specs (windows, 3.3.0)	3m 36s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 29s
	32m 6s

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