common/params: not copyable (#29834)

common/params.h

@@ -15,7 +15,11 @@ enum ParamKeyType {
 
 class Params {
 public:
-  Params(const std::string &path = {});
+  explicit Params(const std::string &path = {});
+  // Not copyable.
+  Params(const Params&) = delete;
+  Params& operator=(const Params&) = delete;
+
   std::vector<std::string> allKeys() const;
   bool checkKey(const std::string &key);
   ParamKeyType getKeyType(const std::string &key);

selfdrive/ui/qt/onroad.cc

@@ -213,7 +213,6 @@ void OnroadAlerts::paintEvent(QPaintEvent *event) {
 ExperimentalButton::ExperimentalButton(QWidget *parent) : experimental_mode(false), engageable(false), QPushButton(parent) {
   setFixedSize(btn_size, btn_size);
 
-  params = Params();
   engage_img = loadPixmap("../assets/img_chffr_wheel.png", {img_size, img_size});
   experimental_img = loadPixmap("../assets/img_experimental.svg", {img_size, img_size});
   QObject::connect(this, &QPushButton::clicked, this, &ExperimentalButton::changeMode);