Disable SX126X_RX_BOOSTED_GAIN for Heltec v4

It causes RX overload and bad RX sensitivity. We should let the LNA
handle the gain.

Author: weebl2000

variants/heltec_v4/HeltecV4Board.cpp

@@ -12,12 +12,13 @@ void HeltecV4Board::begin() {
 
     rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_EN);
     pinMode(P_LORA_PA_EN, OUTPUT);
-    digitalWrite(P_LORA_PA_EN,HIGH);
+    digitalWrite(P_LORA_PA_EN,LOW);
     pinMode(P_LORA_PA_TX_EN, OUTPUT);
     digitalWrite(P_LORA_PA_TX_EN,LOW);
 
 
     periph_power.begin();
+    digitalWrite(P_LORA_PA_EN,HIGH);
 
     esp_reset_reason_t reason = esp_reset_reason();
     if (reason == ESP_RST_DEEPSLEEP) {

variants/heltec_v4/platformio.ini

@@ -30,7 +30,7 @@ build_flags =
   -D SX126X_DIO2_AS_RF_SWITCH=true
   -D SX126X_DIO3_TCXO_VOLTAGE=1.8
   -D SX126X_CURRENT_LIMIT=140
-  -D SX126X_RX_BOOSTED_GAIN=1
+  -D SX126X_RX_BOOSTED_GAIN=0
   -D PIN_GPS_RX=38
   -D PIN_GPS_TX=39
   -D PIN_GPS_RESET=42