Exclude the TetherProvisioningActivity from recents.

This is just a proxy activity for launching the provisioning app.

Bug: 34067614
Test: manual
Change-Id: I8bdf75a7761199d026ef64d6671abc1165879e6b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f4a972b..b0d4902 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -453,6 +453,7 @@
         <activity android:name="TetherProvisioningActivity"
             android:exported="true"
             android:permission="android.permission.TETHER_PRIVILEGED"
+            android:excludeFromRecents="true"
             android:theme="@style/Theme.ProvisioningActivity">
             <intent-filter android:priority="1">
                 <action android:name="android.settings.TETHER_PROVISIONING_UI" />