Fixes #1467 - Check your mixes on Sky9x / 9XR-PRO especially if you used

mix warnings!

companion/src/firmwares/opentx/opentxeeprom.cpp

@@ -867,8 +867,8 @@ class MixField: public TransformedField {
         internalField.Append(new SpareBitsField<8>());
       }
       else if (IS_ARM(board) && version >= 216) {
-        internalField.Append(new UnsignedField<4>(_destCh));
-        internalField.Append(new UnsignedField<4>(mix.mixWarn));
+        internalField.Append(new UnsignedField<5>(_destCh));
+        internalField.Append(new UnsignedField<3>(mix.mixWarn));
         internalField.Append(new UnsignedField<16>(mix.phases));
         internalField.Append(new BoolField<1>(_curveMode));
         internalField.Append(new BoolField<1>(mix.noExpo));

radio/src/myeeprom.h

@@ -609,8 +609,8 @@ PACK(typedef struct {
 }) MixData;
 #else
 PACK(typedef struct {
-  uint8_t  destCh:4;
-  uint8_t  mixWarn:4;         // mixer warning
+  uint8_t  destCh:5;
+  uint8_t  mixWarn:3;         // mixer warning
   uint16_t flightModes;
   uint8_t  curveMode:1;
   uint8_t  noExpo:1;