b/5525982 Fix AllInOne launch behavior

Could get two instances of it before, this makes sure only one
is created.

Change-Id: I54d745e473afd1a3b487a8fffbc4eb3d1068f267
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e60b78a..3db7265 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -50,7 +50,7 @@
         <activity
             android:name="AllInOneActivity"
             android:theme="@style/CalendarTheme.WithActionBar"
-            android:launchMode="singleTop"
+            android:launchMode="singleTask"
             android:windowSoftInputMode="adjustPan"
             android:exported="true">
             <intent-filter>