[MaterialButton] Background color different on short & long click

**Description:** Full description of issue here
The background color of `MaterialButton` (using `@style/Widget.MaterialComponents.Button.OutlinedButton`) on short-click and long-click is different

On short click:

On long click

**Expected behavior:** Screenshots and/or description of expected behavior
The background color should be the same for long click and short click, or an option should be there to have them look the same

**Source code:** The code snippet which is causing this issue
```xml

```

**Android API version:** The device was running android v7.1.2

**Material Library version:** `com.google.android.material:material:1.8.0`

**Device:** model is a5dwg

Start by reproducing the behavior with the provided MaterialButton XML, using the OutlinedButton style on Android 7.1.2 and material version 1.8.0. Compare the short-click and long-click states, then confirm that the background color is consistent or that an option exists to make the states match.

Written by the indexing model from the issue text.