Bsongis/issue 4400 (#4425)

* Cosmetics before fixing #4400

* Cosmetics before fixing #4400

* Now one more conversion issue (SF => SH sources conversion from X9D to X7)

I don't know what is exactly the conversion issue as I don't have the original EEPROM, but I used this one for my tests, so I fix it

* Now we display correctly the corrupted mixers list so that copy/paste will work correctly (it was not consistent)

+ some cosmetics

* Test removed too quickly

* One global removed ;)

companion/src/flasheepromdialog.cpp

@@ -229,8 +229,7 @@ void FlashEEpromDialog::on_burnButton_clicked()
     QFile file(filename);
     uint8_t *eeprom = (uint8_t*)malloc(getEEpromSize(getCurrentBoard()));
     int eeprom_size = getCurrentEEpromInterface()->save(eeprom, *radioData, 0, getCurrentFirmware()->getVariantNumber());
-    if (!eeprom_size) {
-      QMessageBox::warning(this, tr("Error"), tr("Cannot write file %1:\n%2.").arg(filename).arg(file.errorString()));
+    if (eeprom_size == 0) {
       return;
     }
     if (!file.open(QIODevice::WriteOnly)) {