fix(grids): adjust cell merging sample heights (#3762) #42

Job	Run time
build-and-deploy (app-crm, run generate-live-editing:app-crm, angular-demos-crm, /angular-demos-g...	16s
build-and-deploy (app, run generate-live-editing, angular-demos, /angular-demos/, dist/app, run b...	19s
build-and-deploy (app-lob, run generate-live-editing:app-lob, angular-demos-lob, /angular-demos-l...	19s
	54s

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