Fix batch scan tests for Bluetooth LE scan.

Bug:23776097
Change-Id: I0920a606cdf572f6ad4882e40e1b4191e597e954
diff --git a/tests/tests/bluetooth/src/android/bluetooth/cts/BluetoothLeScanTest.java b/tests/tests/bluetooth/src/android/bluetooth/cts/BluetoothLeScanTest.java
index a79df42..cc444a6 100644
--- a/tests/tests/bluetooth/src/android/bluetooth/cts/BluetoothLeScanTest.java
+++ b/tests/tests/bluetooth/src/android/bluetooth/cts/BluetoothLeScanTest.java
@@ -249,7 +249,9 @@
 
         @Override
         public void onBatchScanResults(List<ScanResult> results) {
-            mBatchScanResults = results;
+            // In case onBatchScanResults are called due to buffer full, we want to collect all
+            // scan results.
+            mBatchScanResults.addAll(results);
         }
 
         // Clear regular and batch scan results.