fix: remove extra spi.begin() on heltec v3

Author: oltaco

variants/heltec_v3/target.cpp

@@ -32,7 +32,6 @@ bool radio_init() {
   rtc_clock.begin(Wire);
 
 #if defined(P_LORA_SCLK)
-  spi.begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
   return radio.std_init(&spi);
 #else
   return radio.std_init();