Default to using 44.1 kHz sample rate on Teensy LC

teensy3/AudioStream.h

 #if defined(__MK20DX128__) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
 #define AUDIO_SAMPLE_RATE_EXACT 44117.64706 // 48 MHz / 1088, or 96 MHz * 2 / 17 / 256
 #elif defined(__MKL26Z64__)
-#define AUDIO_SAMPLE_RATE_EXACT 22058.82353 // 48 MHz / 2176, or 96 MHz * 1 / 17 / 256
+//#define AUDIO_SAMPLE_RATE_EXACT 22058.82353 // 48 MHz / 2176, or 96 MHz * 1 / 17 / 256
+#define AUDIO_SAMPLE_RATE_EXACT 44117.64706
 #endif
 #endif