Settings: Correct a couple of default values

src/core/settings.h

@@ -130,10 +130,10 @@ struct GPUSettings
   bool display_pre_frame_sleep : 1 = false;
   bool display_skip_presenting_duplicate_frames : 1 = false;
   bool display_vsync : 1 = false;
-  bool display_disable_mailbox_presentation : 1 = true;
+  bool display_disable_mailbox_presentation : 1 = false;
   bool display_force_4_3_for_24bit : 1 = false;
   bool display_24bit_chroma_smoothing : 1 = false;
-  bool display_show_messages : 1 = false;
+  bool display_show_messages : 1 = true;
   bool display_show_fps : 1 = false;
   bool display_show_speed : 1 = false;
   bool display_show_gpu_stats : 1 = false;