[iOS] Fixed zero padding issue around the card

[jwoo-msft]

Related Issue

Fixed #5501

Description

Not applying padding at zero causes the ACRView to assume default layout configuration, this isn't wrong, but it is an inconsistent behavior compared to when padding > 0. This fix applies padding even if it's zero.

Sample Card

Payload

{
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.3",
    "body": [
        {
            "type": "Container",
            "style": "accent",
            "items": [
                {
                    "type": "ColumnSet",
                    "height": "stretch",
                    "columns": [
                        {
                            "type": "Column",
                            "items": [
                                {
                                    "type": "TextBlock",
                                    "text": "Some text!",
                                    "size": "extraLarge",
                                    "weight": "bolder",
                                    "horizontalAlignment": "center"
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}

Hostconfig

{
    "spacing" : {
        "padding" : 0
    }
}

How Verified

Before Fix

After Fix

Microsoft Reviewers: Open in CodeFlow

[paulcam206]