update example to use new define, fix build error

Author: hathach

libraries/Bluefruit52Lib/examples/Peripheral/ancs_oled/ancs_oled.ino

@@ -27,7 +27,7 @@
 #include <bluefruit.h>
 
 /*------------- OLED and Buttons -------------*/
-#if defined ARDUINO_NRF52_FEATHER
+#if defined ARDUINO_NRF52832_FEATHER
 // Feather nRF52832
 #define BUTTON_A    31
 #define BUTTON_B    30
@@ -456,4 +456,5 @@ uint32_t readPressedButtons(void)
   lastDebounced = debounced;
 
   return result;
-}
+}
+

libraries/Bluefruit52Lib/examples/Projects/rssi_proximity/rssi_proximity_central/rssi_proximity_central.ino

@@ -95,7 +95,7 @@ BLEUuid uuid = BLEUuid(CUSTOM_UUID);
   #include <Adafruit_ILI9341.h>
 
    /* Pin setup for the TFT display over SPI */
-  #ifdef ARDUINO_NRF52_FEATHER
+  #ifdef ARDUINO_NRF52832_FEATHER
      #define TFT_DC   11
      #define TFT_CS   31
      #define STMPE_CS 30
@@ -114,7 +114,7 @@ BLEUuid uuid = BLEUuid(CUSTOM_UUID);
   #include <Adafruit_SSD1306.h>
 
   /* Pin setup for the OLED display */
-  #ifdef ARDUINO_NRF52_FEATHER
+  #ifdef ARDUINO_NRF52832_FEATHER
     #define BUTTON_A 31
     #define BUTTON_B 30
     #define BUTTON_C 27