correct inconsistency in spacing "Sort By" for narrow screens (#3938)
Mimicked the approach used in other tabs under "My Library":
* Adding bottom margin to search field to keep distance from "Sort By"
* Fixing extra left margin on "Sort By" for narrow screens
* Removed the `ml-2` class so that `!important` is no longer needed
* Removed unnecessary `!important` from account video search field width