Fix scoping issues for double click to Z-Babystepping

Marlin/ultralcd.cpp

@@ -49,6 +49,12 @@ int lcd_preheat_hotend_temp[2], lcd_preheat_bed_temp[2], lcd_preheat_fan_speed[2
   millis_t previous_lcd_status_ms = 0;
 #endif
 
+#if ENABLED(BABYSTEPPING)
+  long babysteps_done = 0;
+  millis_t status_screen_click_time = 0;
+  static void lcd_babystep_z();
+#endif
+
 uint8_t lcd_status_message_level;
 char lcd_status_message[3 * (LCD_WIDTH) + 1] = WELCOME_MSG; // worst case is kana with up to 3*LCD_WIDTH+1