digitalPinToInterrupt: fix double pin remapping (#10372)

The digitalPinToInterrupt() macro currently remaps the pin number to the
GPIO number. This is not necessary, as most users will then use the
returned value in attachInterrupt() or other similar API functions,
which already perform the same remapping.

The first half of the macro (the condition) does indeed require the
remapping to ensure the check operates on GPIO numbers.

Fixes #10367.

cores/esp32/Arduino.h

@@ -138,7 +138,7 @@
 #endif
 #define EXTERNAL_NUM_INTERRUPTS NUM_DIGITAL_PINS  // All GPIOs
 #define analogInputToDigitalPin(p)  (((p)<NUM_ANALOG_INPUTS)?(analogChannelToDigitalPin(p)):-1)
-#define digitalPinToInterrupt(p)    ((((uint8_t)digitalPinToGPIONumber(p))<NUM_DIGITAL_PINS)?digitalPinToGPIONumber(p):NOT_AN_INTERRUPT)
+#define digitalPinToInterrupt(p)    ((((uint8_t)digitalPinToGPIONumber(p))<NUM_DIGITAL_PINS)?(p):NOT_AN_INTERRUPT)
 #define digitalPinHasPWM(p)         (((uint8_t)digitalPinToGPIONumber(p))<NUM_DIGITAL_PINS)
 
 typedef bool boolean;