Added missing GUI box for MSP override.

src/main/config/config.c

@@ -581,6 +581,10 @@ static void validateAndFixConfig(void)
     validateAndFixRatesSettings();  // constrain the various rates settings to limits imposed by the rates type
 
 #if defined(USE_RX_MSP_OVERRIDE)
+    if (!rxConfig()->msp_override_channels_mask) {
+        removeModeActivationCondition(BOXMSPOVERRIDE);
+    }
+
     for (int i = 0; i < MAX_MODE_ACTIVATION_CONDITION_COUNT; i++) {
         const modeActivationCondition_t *mac = modeActivationConditions(i);
         if (mac->modeId == BOXMSPOVERRIDE && ((1 << (mac->auxChannelIndex) & (rxConfig()->msp_override_channels_mask)))) {

src/main/msp/msp_box.c

@@ -333,6 +333,12 @@ void initActiveBoxIds(void)
     BME(BOXLAUNCHCONTROL);
 #endif
 
+#if defined(USE_RX_MSP_OVERRIDE)
+    if (rxConfig()->msp_override_channels_mask) {
+        BME(BOXMSPOVERRIDE);
+    }
+#endif
+
     BME(BOXSTICKCOMMANDDISABLE);
 
 #undef BME