Fix emulator #ifdef check

visualizer.c

@@ -414,7 +414,7 @@ static DECLARE_THREAD_FUNCTION(visualizerThread, arg) {
         gdispGFlush(LED_DISPLAY);
 #endif
 
-#if EMULATOR
+#ifdef EMULATOR
         draw_emulator();
 #endif
         // The animation can enable the visualizer

visualizer.h

@@ -51,7 +51,7 @@ GDisplay* get_lcd_display(void);
 GDisplay* get_led_display(void);
 
 // For emulator builds, this function need to be implemented
-#if EMULATOR
+#ifdef EMULATOR
 void draw_emulator(void);
 #endif