Fix declaration and definition type mismatch of lcd_change_fil_state. Move declaration to Marlin.h.

Firmware/Marlin.h

@@ -282,6 +282,7 @@ extern bool axis_known_position[3];
 extern float zprobe_zoffset;
 extern int fanSpeed;
 extern void homeaxis(int axis, uint8_t cnt = 1, uint8_t* pstep = 0);
+extern int8_t lcd_change_fil_state;
 
 
 #ifdef FAN_SOFT_PWM

Firmware/ultralcd.cpp

@@ -37,7 +37,6 @@
 
 #include "mmu.h"
 
-extern int lcd_change_fil_state;
 extern bool fans_check_enabled;