fix vertical alignment of Learner Group filters with no choices #6415

Job	Run time
Lint	1m 0s
frontend Build (20)	1m 45s
frontend Build With Embroider	2m 41s
test-app Build (20)	1m 22s
lti-course-manager Build With Embroider	2m 29s
lti-course-manager Build (20)	1m 15s
frontend Test (20)	8m 42s
lti-dashboard Build With Embroider	2m 21s
lti-dashboard Build (20)	1m 14s
test-app Test (20)	3m 56s
lti-course-manager Test (20)	56s
frontend Test With Embroider	8m 49s
lti-dashboard Test (20)	58s
lti-course-manager Test With Embroider	51s
lti-dashboard Test With Embroider	1m 4s
Scan with UCSF SonarQube	33s
frontend Firefox latest-esr	8m 54s
test-app Firefox latest-esr	4m 27s
lti-course-manager Firefox latest-esr	1m 12s
lti-dashboard Firefox latest-esr	1m 15s
	55m 44s

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