[css-ui-4] line height has an effect on <input>

part of #1941

Author: frivoal

css-ui-4/Overview.bs

@@ -2586,7 +2586,6 @@ must be rendered so that:
 * The content is clipped in the block direction to the <a>padding edge</a>
 * The content is vertically centered
 * The content does not wrap
-* The 'line-height' property has no effect
 * The 'text-overflow' property applies regardless of the value of the 'overflow' property
 
 <hr title="Separator from footer">