Give search-input correct padding-right value

What does this MR do?

This fixes how padding-right: 20px was being applied to the style rule of .search-input, preventing text in that form from clipping through .search-icon

Are there points in the code the reviewer needs to double check?

If there are any cases where .search .search-input is used in a search form where there is no right-side icon (I could not find such occurrence myself).

Why was this MR needed?

Some text in long search queries were being hidden by the close icon being used in the search form. This makes it a bit more presentable. ;)

Screenshots (if relevant)

Before

After