Update clang-tidy configuration and fix some warnings (#1474)

Don't enable coding conventions from unrelated projects. Only enable
generic checks.

src/displayapp/screens/HeartRate.cpp

@@ -64,8 +64,9 @@ HeartRate::HeartRate(Pinetime::Applications::DisplayApp* app,
 
   label_startStop = lv_label_create(btn_startStop, nullptr);
   UpdateStartStopButton(isHrRunning);
-  if (isHrRunning)
+  if (isHrRunning) {
     systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
+  }
 
   taskRefresh = lv_task_create(RefreshTaskCallback, 100, LV_TASK_PRIO_MID, this);
 }
@@ -110,8 +111,9 @@ void HeartRate::OnStartStopEvent(lv_event_t event) {
 }
 
 void HeartRate::UpdateStartStopButton(bool isRunning) {
-  if (isRunning)
+  if (isRunning) {
     lv_label_set_text_static(label_startStop, "Stop");
-  else
+  } else {
     lv_label_set_text_static(label_startStop, "Start");
+  }
 }