Fix EBADF test to catch any of the possible messages

Author: iamed2

test/runtests.jl

@@ -611,16 +611,12 @@ end
                     close(Base.Libc.FILE(LibPQ.socket(conn), "r"))  # close socket
                     LibPQ._connect_poll(conn, Timer(0), 0)
 
-                    errs = map(LibPQ.Errors.PQConnectionError, [
-                        "could not receive data from server: Bad file descriptor\n",
-                        "could not get socket error status: Bad file descriptor\n",
-                    ])
-
                     try
                         LibPQ.handle_new_connection(LibPQ.Connection(conn))
                         @test false
                     catch err
-                        @test err in errs
+                        @test err isa LibPQ.Errors.PQConnectionError
+                        @test occursin("Bad file descriptor", sprint(show, err))
                     end
                 end
             end