Glimpse: Ignore enableOnBackInvokedCallback target API warning

Change-Id: If2b53f85d48993779e4c35ad9300dee61ee67109
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 4bec75b..eb89275 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -24,7 +24,8 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/Theme.Glimpse">
+        android:theme="@style/Theme.Glimpse"
+        tools:targetApi="tiramisu">
 
         <activity
             android:name=".MainActivity"