Make `UselssAssertion` autocorrect `contextual` #129

Job	Run time
Check documentation syntax	24s
JRuby 9.4	1m 57s
Check the oldest supported RuboCop version	59s
Prism	43s
Ruby 2.7	53s
Ruby 3.0	35s
Ruby 3.1	37s
Ruby 3.2	47s
Ruby 3.3	31s
Ruby head	23s
	7m 49s

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