Add BLE setScanDuplicateCacheSize (#911)

#906

main/ZgatewayBT.ino

@@ -633,6 +633,7 @@ class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
 void BLEscan() {
   disableCore0WDT();
   Log.notice(F("Scan begin" CR));
+  BLEDevice::setScanDuplicateCacheSize(BLEScanDuplicateCacheSize);
   BLEDevice::init("");
   BLEScan* pBLEScan = BLEDevice::getScan();
   MyAdvertisedDeviceCallbacks myCallbacks;