Use BLUETOOTH_PAIRING metric in pairing page

Bug: 38383542
Test: Build
Change-Id: Ibc8acfa7ad7766b112389509971a36d1a4ce2394
diff --git a/src/com/android/settings/bluetooth/BluetoothPairingDetail.java b/src/com/android/settings/bluetooth/BluetoothPairingDetail.java
index 987fd3b..6545ed1 100644
--- a/src/com/android/settings/bluetooth/BluetoothPairingDetail.java
+++ b/src/com/android/settings/bluetooth/BluetoothPairingDetail.java
@@ -94,8 +94,7 @@
 
     @Override
     public int getMetricsCategory() {
-        //TODO(b/38383542): add bluetooth pairing category
-        return MetricsEvent.BLUETOOTH;
+        return MetricsEvent.BLUETOOTH_PAIRING;
     }
 
     @Override