fix warnings

src/graphics/Screen.cpp

@@ -143,11 +143,13 @@ static void drawBootScreen(OLEDDisplay *display, OLEDDisplayUiState *state, int1
     drawIconScreen(region, display, state, x, y);
 }
 
+#ifdef HAS_EINK
 /// Used on eink displays while in deep sleep
 static void drawSleepScreen(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)
 {
     drawIconScreen("Sleeping...", display, state, x, y);
 }
+#endif
 
 static void drawPluginFrame(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)
 {