Fix an infinite loop for Style/RaiseArgs with EnforcedStyle: compact when passing more than 2 arguments to raise

[Earlopain]

The following test causes the loop:

rubocop/spec/rubocop/cop/style/raise_args_spec.rb

Lines 130 to 140 in 5ee786d

	context 'with a raise with 3 args' do
	it 'reports an offense' do
	expect_offense(<<~RUBY)
	raise RuntimeError, msg, caller
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Provide an exception object as an argument to `raise`.
	RUBY
	expect_no_corrections
	end
	end

This changes expect_no_corrections to always raise if there are correctors. In this case the corrector replaced nothing, resulting in the same cop being invocted again for the same reason.

Undoing the cop change while keeping the assertion change will produce a failure. The source assertion is left in because it produces nice diffs if there are actually changes.

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• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[bbatsov]

Thanks!