remove libopenui paint implementation for lvgl-elements

radio/src/thirdparty/libopenui/src/basenumberedit.h

@@ -153,6 +153,8 @@ class BaseNumberEdit: public FormField
       setValue(currentValue);
     }
 
+    virtual void paint(BitmapBuffer* dc) override {};
+
   protected:
     int vdefault = 0;
     int vmin;

radio/src/thirdparty/libopenui/src/textedit.h

@@ -54,6 +54,8 @@ class TextEdit : public FormField {
 
     void onFocusLost() override;
 
+    virtual void paint(BitmapBuffer* dc) override {};
+
   protected:
     char * value;
     bool changed = false;