Update BT pairing dialog

1. Remove hardcoded color
2. Add taskAffinity for activity

Fixes: 124953564
Fixes: 124958778
Test: Manual
Change-Id: Id57fadc02e3c4fa3683632c0ad6a451117b732f1
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index a94801f..8601eab 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1874,7 +1874,8 @@
         <activity android:name=".bluetooth.BluetoothPairingDialog"
                   android:excludeFromRecents="true"
                   android:windowSoftInputMode="stateVisible|adjustResize"
-                  android:theme="@style/Theme.AlertDialog">
+                  android:theme="@style/Theme.AlertDialog"
+                  android:taskAffinity=".bluetooth.BluetoothPairingDialog">
             <intent-filter android:priority="1">
                 <action android:name="android.bluetooth.device.action.PAIRING_REQUEST" />
                 <category android:name="android.intent.category.DEFAULT" />