fix(test): Fix the StaleReferenceError in settings_clients.js test. (#5596) r=@vbudhram
fix(test): Fix the StaleReferenceError in settings_clients.js test. (#5596) r=@vbudhram

visibleByQSA on the refresh button is necessary to prevent a
StaleElementReference error. w/o it, a reference to the
refresh button is used from before the panel refresh.

fixes #5593
shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server