[Fix #1053] Fix an error occurred for `Rails/FilePath` cop when nested `File.join` #539

Job	Run time
Check documentation syntax	16s
Spec - JRuby	2m 4s
Check the oldest supported RuboCop version	29s
Spec - 2.7	27s
Spec - 3.0	1m 1s
Prism	29s
Spec - 3.1	46s
Spec - 3.2	17s
Spec - 3.3	23s
Spec - 3.4	17s
Spec - head	17s
	6m 46s

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