Change `RSpec/ContextWording` cop to always report an offense when both `Prefixes` and `AllowedPatterns` are empty #2350

Job	Run time
Confirm config and documentation	9s
Test coverage	21s
Edge RuboCop: internal_investigation	13s
Ruby 2.7: internal_investigation	24s
Edge RuboCop: spec	20s
Ruby 2.7: spec	31s
Ruby 3.0: internal_investigation	10s
Oldest RuboCop: spec	21s
Ruby 3.0: spec	16s
Ruby 3.1: internal_investigation	16s
Ruby 3.1: spec	19s
RSpec 4	21s
Ruby 3.2: internal_investigation	9s
Ruby 3.2: spec	17s
Ruby 3.3: internal_investigation	13s
Ruby 3.3: spec	18s
Ruby ruby-head: internal_investigation	12s
Ruby ruby-head: spec	17s
Ruby jruby-9.4: internal_investigation	1m 17s
Ruby jruby-9.4: spec	1m 17s
	7m 41s

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