test: Remove unnecessary usage of the DisplayNormalizer in DiffTest #762

Job	Run time
AutoReview Tests	13s
Lint CS	40s
Unit Tests (PHP 8.1, locked)	22s
Wait for the PHAR & Docker images	11m 7s
Unit Tests (PHP 8.1, lowest)	30s
Unit Tests (PHP 8.1, highest)	19s
Unit Tests (PHP 8.2, highest)	29s
Unit Tests (PHP 8.3, highest, --ignore-platform-req=php+)	57s
Update the RequirementChecker	0s
End-to-End Tests (_test_e2e_pass_no_config_min_composer_php, ghcr.io/box-project/box_php725)	40s
End-to-End Tests (_test_e2e_pass_no_config_min_box_php, ghcr.io/box-project/box_php81)	9s
End-to-End Tests (_test_e2e_pass_complete_min_composer_php, ghcr.io/box-project/box_php725)	9s
End-to-End Tests (_test_e2e_pass_complete_min_box_php, ghcr.io/box-project/box_php81)	8s
End-to-End Tests (_test_e2e_fail_complete_min_composer_php, ghcr.io/box-project/box_php725)	10s
End-to-End Tests (_test_e2e_fail_complete_min_box_php, ghcr.io/box-project/box_php81)	21s
End-to-End Tests (_test_e2e_skip_min_composer_php, ghcr.io/box-project/box_php725)	10s
End-to-End Tests (_test_e2e_pass_complete_requirement_checker_not_disabled, ghcr.io/box-project/b...	14s
End-to-End Tests (_test_e2e_fail_conflict, ghcr.io/box-project/box_php81)	24s
RequirementChecker status	2s
	17m 4s

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