OTA update improved error messages

The OTA update class can deliver an error message.

old: "Please check your file and retry"
new: "Could Not Activate The Firmware. (wrong board type?). Please check your file and retry!"

Author: softhack007

wled00/wled_server.cpp

@@ -329,7 +329,15 @@ void initServer()
       return;
     }
     if (Update.hasError() || otaLock) {
+#ifdef ARDUINO_ARCH_ESP32
+      if (Update.hasError()) {
+        String updErr = Update.getError() == UPDATE_ERROR_ACTIVATE ? String("Could Not Activate The Firmware. (wrong board type?)") : String(Update.errorString());
+        serveMessage(request, 500, F("Update failed!"), updErr + String("<br>Please check your file and retry!"), 254);
+      } else
+        serveMessage(request, 500, F("Update failed!"), F("Please check your file and retry! (OTA may be locked)"), 254);
+#else
       serveMessage(request, 500, F("Update failed!"), F("Please check your file and retry!"), 254);
+#endif
     } else {
       serveMessage(request, 200, F("Update successful!"), F("Rebooting..."), 131);
       doReboot = true;