Remove unused ALARM_PIN

Remove unused ALARM_PIN from all the Configuration.h's

Marlin/pins_5DPRINT.h

@@ -47,7 +47,6 @@
 #define LED_PIN            -1
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
-#define ALARM_PIN          -1
 
 // The SDSS pin uses a different pin mapping from file Sd2PinMap.h
 #define SDSS               20

Marlin/pins_BRAINWAVE.h

@@ -48,7 +48,6 @@
 #define LED_PIN            39
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
-#define ALARM_PIN          -1
 
 #if DISABLED(SDSUPPORT)
   // these pins are defined in the SD library if building with SD support

Marlin/pins_BRAINWAVE_PRO.h

@@ -53,7 +53,6 @@
 #define LED_PIN            19
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
-#define ALARM_PIN          -1
 #define SD_DETECT_PIN      12
 
 #if DISABLED(SDSUPPORT)

Marlin/pins_PRINTRBOARD.h

@@ -68,7 +68,6 @@
 #define LED_PIN            -1
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
-#define ALARM_PIN          -1
 
 #if DISABLED(SDSUPPORT)
   // these pins are defined in the SD library if building with SD support

Marlin/pins_SAV_MKI.h

@@ -82,7 +82,6 @@
 #define SDPOWER            -1
 #define LED_PIN            -1
 #define PS_ON_PIN          -1
-#define ALARM_PIN          -1
 #define SD_DETECT_PIN      -1
 
 #define BEEPER_PIN         -1

Marlin/pins_TEENSY2.h

@@ -91,7 +91,6 @@
 #define LED_PIN             6
 #define PS_ON_PIN          27
 #define KILL_PIN           -1
-#define ALARM_PIN          -1
 
 #if DISABLED(SDSUPPORT)
   // these pins are defined in the SD library if building with SD support

Marlin/pins_TEENSYLU.h

@@ -58,7 +58,6 @@
 #define LED_PIN            -1
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
-#define ALARM_PIN          -1
 
 #if DISABLED(SDSUPPORT)
   // these pins are defined in the SD library if building with SD support