Revert "[TMP] Completely kill app instead of activity only"

This reverts commit 2cba0430e69373a8a400f1f48cdcb572daa690cd.

vector/src/main/java/im/vector/riotx/core/platform/VectorBaseActivity.kt

@@ -188,8 +188,7 @@ abstract class VectorBaseActivity : AppCompatActivity(), HasScreenInjector {
             if (!it.hasBeenHandled) {
                 // Recreate the Activity because configuration has changed
                 startActivity(intent)
-                //finish()
-                Runtime.getRuntime().exit(0)
+                finish()
             }
         })