Install from Web Clear search

[brianteeman]

In the web installer it is never possible to clear a search

Steps to reproduce the issue

Go to the extensions installer and the Install from web tab.
In the search box enter backup and click on search

Expected result

Search is performed
Search box contains the string searched for (backup)
Clear button is enabled

Actual result

Search is performed
Search box empty
Clear button is disabled

System information (as much as possible)

Additional comments

[Quy]

Closing as duplicate of #41966.