corrected name of keypadRegisters

This name should not be the same as any other library. This will cause compilation erros if using both libraries. It was originally copied from the qwiic joystick, which was copied from the qwiic twist (hence the name "encoderRegisters")

Author: lewispg228

src/SparkFun_Qwiic_Keypad_Arduino_Library.h

@@ -32,7 +32,7 @@
 #define QWIIC_KEYPAD_ADDR 0x4B //7-bit unshifted default I2C Address
 
 //Map to the various registers on the Keypad
-enum encoderRegisters {
+enum keypadRegisters {
   KEYPAD_ID = 0x00,
   KEYPAD_VERSION1, // 0x01
   KEYPAD_VERSION2, // 0x02