fix(PageHeader): remove extra padding class when no subtitle is defin… #568

Job	Run time
call-build-lint-test-workflow / build	22s
call-build-lint-test-workflow / test_a11y	1m 21s
call-build-lint-test-workflow / test_jest	1m 1s
call-build-lint-test-workflow / test_cypress	1m 16s
call-build-lint-test-workflow / lint	19s
deploy	2m 20s
	6m 39s

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