api: Don't HTML escape application/json responses

An HTTP response with Content-Type application/json does not need
to be HTML escaped. Doing this causes encoding issues in the Podman
REST API output as seen in the issue:

Fixes #17769

Remove the HTML escaping from Content-Type: application/json responses.

Signed-off-by: Stef Walter <stef@thewalter.net>

pkg/api/handlers/utils/handler.go

@@ -120,7 +120,7 @@ func WriteJSON(w http.ResponseWriter, code int, value interface{}) {
 	w.WriteHeader(code)
 
 	coder := json.NewEncoder(w)
-	coder.SetEscapeHTML(true)
+	coder.SetEscapeHTML(false)
 	if err := coder.Encode(value); err != nil {
 		logrus.Errorf("Unable to write json: %q", err)
 	}