Fix error message in headless request.go #5770
Description
Current Behavior
Could not execute request for http://x.x.x.x/: could get html element: error occurred executing action: [:RUNTIME] could not navigate to url http://x.x.x.x/login <- navigation failed: net::ERR_ADDRESS_UNREACHABLE
Expected Behavior
Could not execute request for http://x.x.x.x/: could not get html element: error occurred executing action: [:RUNTIME] could not navigate to url http://x.x.x.x/login <- navigation failed: net::ERR_ADDRESS_UNREACHABLE