Slightly improve QR code speed

include/camera.h

@@ -29,8 +29,6 @@
 
 #include "common.h"
 
-struct quirc* context;
-u16 *buf;
 bool qr_mode;
 
 void init_qr(void);

include/draw.h

@@ -35,7 +35,6 @@ void init_screens(void);
 void exit_screens(void);
 
 void draw_themext_error(void);
-void draw_qr(void);
 void draw_base_interface(void);
 void draw_theme_install(int install_type);
 void draw_theme_interface(Theme_s * themes_list, int theme_count, int selected_theme, bool preview_mode, int shuffle_theme_count);