fix: sd-combobox mobile visual issues #5850

Job	Run time
Verify (packages/components)	2m 51s
Verify (packages/styles)	56s
Verify (packages/placeholders)	52s
Verify (packages/tokens)	52s
Verify (packages/docs)	8m 22s
Verify (packages/eslint-plugin)	54s
Verify (packages/theming)	54s
Verify Chromatic	1m 50s
	17m 31s

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