[MOB - 4026] Fix - App not visible in recent apps

1. `singleInstance` launchmode of TrampolineActivity did not allow for parent activity to show in recent apps after destorying itself. Setting it to `singleTop` allows it.

Author: Ayyanchira

iterableapi/src/main/AndroidManifest.xml

@@ -25,7 +25,7 @@
         <activity
             android:name=".IterableTrampolineActivity"
             android:exported="false"
-            android:launchMode="singleInstance"
+            android:launchMode="singleTop"
             android:theme="@style/TrampolineActivity.Transparent"/>
     </application>