Fixed a fixed height issue of input-group size option

Created by: ysds

If set a rows attribute to a textarea in an input group, it has no effect:

This issue has occurred from 4.1.3 (#26820).

• 4.1.3: https://codepen.io/anon/pen/qQPprY
• 4.1.2: https://codepen.io/anon/pen/jQGZMa

This PR remove the incorrect settings of height.

• After: https://codepen.io/anon/pen/eQGyVG

This also relates to #27505 (closed).