make IAM's popup window non-focusable

* Revert the focusable property of the PopupWindow that displays an IAM view to be false. This was added as part of fullbleed IAM implementation in #1481, but does not appear to be necessary.
* This allows banner-style top and bottom IAMs to remain on the screen while the user interacts with the app.
* Otherwise, currently, tapping on the background dismisses the banner-style IAM.

OneSignalSDK/onesignal/in-app-messages/src/main/java/com/onesignal/inAppMessages/internal/display/impl/InAppMessageView.kt

@@ -274,7 +274,7 @@ internal class InAppMessageView(
                 parentRelativeLayout,
                 if (hasBackground) WindowManager.LayoutParams.MATCH_PARENT else pageWidth,
                 if (hasBackground) WindowManager.LayoutParams.MATCH_PARENT else WindowManager.LayoutParams.WRAP_CONTENT,
-                true,
+                false,
             )
         popupWindow!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
         popupWindow!!.isTouchable = true