Fix mistake in new code

All I can say is it compiled in IDE 1.5.7...

RF24.h

@@ -52,8 +52,8 @@ class RF24
  bool dynamic_payloads_enabled; /**< Whether dynamic payloads are enabled. */
  uint8_t pipe0_reading_address[5]; /**< Last address set on pipe 0 for reading. */
  uint8_t addr_width; /**< The address width to use - 3,4 or 5 bytes. */
- uint32_t lastAvailableCheck = 0; /**< Limits the amount of time betwen reading data, only when switching between modes */
- boolean listeningStarted = 1; /**< Var for delaying available() after start listening */
+ uint32_t lastAvailableCheck; /**< Limits the amount of time between reading data, only when switching between modes */
+ boolean listeningStarted; /**< Var for delaying available() after start listening */
 
 public: