fix(expansion-panel): title text not centered with taller description (#12161)
fix(expansion-panel): title text not centered with taller description (#12161)

Fixes the expansion panel's title not being centered vertically if the description is taller.
crisbeto/material2,angular/components,crisbeto/material2,crisbeto/material2,angular/components,crisbeto/material2,angular/components,angular/components