How to hide the banner “This site is read only at the farm administrator’s request” after putting SP site in read only mode?

Today, as per client requirement,I made one of the site collections in our production environment on SP 2013 in read only mode. After doing so, we are getting

This site is read only at the farm administrator’s request

banner at the top of the page.

Is there any PowerShell command to hide this banner from the page?

Thanks in advance!!!