[relay] always enable Relay dev tools
[relay] always enable Relay dev tools

This removes the URL gating from the Relay dev tab and always enables it if
Relay is found on the page.

aarondancer/react-devtools,jhen0409/react-devtools,jhen0409/react-devtools,woowe/react-dev-tools,keyanzhang/react-devtools,aolesky/react-devtools,aarondancer/react-devtools,woowe/react-dev-tools,aolesky/react-devtools,aarondancer/react-devtools,jhen0409/react-devtools,woowe/react-dev-tools,aolesky/react-devtools,keyanzhang/react-devtools,aadsm/react-devtools,aadsm/react-devtools,aadsm/react-devtools