Clean up CaseAssignmentsController#show_or_hide_contacts and corresponding skipped spec #246

Job	Run time
preparation	25s
rspec_parallel ([0, 1, 2]) / RSpec Groups [0, 1, 2]	2m 34s
rspec_parallel ([9, 10, 11]) / RSpec Groups [9, 10, 11]	3m 58s
rspec_parallel ([6, 7, 8]) / RSpec Groups [6, 7, 8]	3m 45s
rspec_parallel ([3, 4, 5]) / RSpec Groups [3, 4, 5]	3m 30s
combine_and_report / combine_and_report	24s
	14m 36s

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