Fix issue with SX1280 TX power not being set properly

Radio.cpp

@@ -2295,7 +2295,7 @@ void sx128x::setTxPower(int level, int outputPin) {
             break;
     }
 
-    tx_buf[0] = reg_value;
+    tx_buf[0] = reg_value + 18;
     tx_buf[1] = 0xE0; // ramping time - 20 microseconds
 
     executeOpcode(OP_TX_PARAMS_8X, tx_buf, 2);
@@ -2381,7 +2381,7 @@ void sx128x::setTxPower(int level, int outputPin) {
                 break;
         }
 
-        tx_buf[0] = level;
+        tx_buf[0] = reg_value + 18;
         tx_buf[1] = 0xE0; // ramping time - 20 microseconds
     #else
     // For SX1280 boards with no specific PA requirements
@@ -2393,7 +2393,7 @@ void sx128x::setTxPower(int level, int outputPin) {
 
         _txp = level;
 
-        tx_buf[0] = level;
+        tx_buf[0] = level + 18;
         tx_buf[1] = 0xE0; // ramping time - 20 microseconds
     #endif
     executeOpcode(OP_TX_PARAMS_8X, tx_buf, 2);