Fix pin definitions of the interface to the nrf24l01

weather-sensor/firmware/nrf24l01.h

 /* AVR I/O pin definionts */
 #define NRF_CE_DDR   DDRD
 #define NRF_CE_PORT  PORTD
-#define NRF_CE_PIN   PB7
+#define NRF_CE_PIN   PD7
 
 #define NRF_CSN_DDR   DDRD
 #define NRF_CSN_PORT  PORTD
-#define NRF_CSN_PIN   PB6
+#define NRF_CSN_PIN   PD6
 
 void Initialize_NRF24L01(void);
 void Set_NRF24L01_Pins(void);