commands: NewRootCmd: remove obsolete logrus filter hook

This hook was added in 278f94a8b6 and
72758fef22 to suppress spurious warnings
printed by the CLI's cli/connhelper/commandconn package;
3fb4fb83df/cli/connhelper/commandconn/commandconn.go (L203-L214)

Those logs were removed in a5ebe2282a
so we can remove the hook.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 094d1aded8)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

commands/root.go

@@ -52,17 +52,6 @@ func NewRootCmd(name string, isPlugin bool, dockerCli command.Cli) *cobra.Comman
 		"using default config store",
 	))
 
-	// filter out useless commandConn.CloseWrite warning message that can occur
-	// when listing builder instances with "buildx ls" for those that are
-	// unreachable: "commandConn.CloseWrite: commandconn: failed to wait: signal: killed"
-	// https://github.com/docker/cli/blob/3fb4fb83dfb5db0c0753a8316f21aea54dab32c5/cli/connhelper/commandconn/commandconn.go#L203-L214
-	logrus.AddHook(logutil.NewFilter([]logrus.Level{
-		logrus.WarnLevel,
-	},
-		"commandConn.CloseWrite:",
-		"commandConn.CloseRead:",
-	))
-
 	addCommands(cmd, dockerCli)
 	return cmd
 }