[le audio] BassClient clear notified flag before new scanning

Bug: 287357243
Tag: #bug
Test: atest BassClientServiceTest
Test: manually test assistant to observe sources are always notified
Change-Id: Id6deecbee5429ff3c5337cfe1e588586679f00e8

android/app/src/com/android/bluetooth/bass_client/BassClientService.java

@@ -983,6 +983,11 @@ public class BassClientService extends ProfileService {
                 }
             };
             mScanBroadcasts.clear();
+            // clear previous sources notify flag before scanning new result
+            // this is to make sure the active sources are notified even if already synced
+            if (mPeriodicAdvertisementResultMap != null) {
+                clearNotifiedFlags();
+            }
             ScanSettings settings = new ScanSettings.Builder().setCallbackType(
                     ScanSettings.CALLBACK_TYPE_ALL_MATCHES)
                     .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)