Fix Rubocop warnings for core/module/name_spec.rb #23

Job	Run time
RuboCop	30s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 32s
specs (ubuntu, 3.2.2)	1m 29s
specs (ubuntu, 3.3.0)	1m 24s
specs (macos, 3.0.6)	1m 16s
specs (macos, 3.1.4)	1m 6s
specs (macos, 3.2.2)	1m 10s
specs (macos, 3.3.0)	54s
specs (windows, 3.0.6)	3m 27s
specs (windows, 3.1.4)	4m 36s
specs (windows, 3.2.2)	4m 34s
specs (windows, 3.3.0)	4m 33s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 22s
	29m 22s

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