[ShapeableImageView] contentPadding not working when set via Kotlin

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**Description:**
When setting `contentPadding` on a `ShapeableImageView` in code (Kotlin or Java), it does not work as expected. Setting `app:contentPadding` via `XML` works fine.

**Expected behavior:**
Both elements should match and be like the top element.

**Source code:**

`MainActivity.kt`
```kotlin
package com.example.bug

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.TypedValue
import com.google.android.material.imageview.ShapeableImageView

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

val px = TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
8f,
resources.displayMetrics
).toInt()

findViewById(R.id.kotlin)?.setContentPadding(px, px, px, px)
}
}
```

`activity_main.xml`
```xml

```

`styles.xml`
```xml

<item name="cornerFamily">rounded</item>
<item name="cornerSize">50%</item>

```

**Android API version:** 30

**Material Library version:** 1.3.0

**Device:** Pixel 3 and others

Start by reproducing the difference between app:contentPadding in activity_main.xml and setContentPadding in MainActivity.kt using ShapeableImageView. Read the ShapeableImageView entry point and styles.xml, then verify that programmatic and XML padding produce the same result on the reported Android setup.

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