Add braces to ensure correct order of operant execution.

Author: aentinger

src/AIoTC_Config.h

@@ -100,7 +100,7 @@
   #define OTA_STORAGE_SSU         (0)
 #endif
 
-#if OTA_STORAGE_SFU || OTA_STORAGE_SSU || OTA_STORAGE_SNU && !defined(ARDUINO_AVR_UNO_WIFI_REV2)
+#if (OTA_STORAGE_SFU || OTA_STORAGE_SSU || OTA_STORAGE_SNU) && !defined(ARDUINO_AVR_UNO_WIFI_REV2)
   #define OTA_ENABLED             (1)
 #else
   #define OTA_ENABLED             (0)