MatStep.interacted is always false for last step

[LastDragon-ru]

Reproduction

Steps to reproduce:

1. Open https://stackblitz.com/edit/angular-dytmpt
2. Click Next => Interacted = true
3. Fill field
4. Click Next
5. Click Next => Interacted = false

This bug also prevents to update error state for controls on the last step.

Demo

Expected Behavior

On the last step interacted must be set to true after Next like on other steps.

Actual Behavior

On the last step interacted is always false

Environment

• Angular: 8.2.14
• CDK/Material: 8.2.3
• Browser(s): chrome latest
• Operating System (e.g. Windows, macOS, Ubuntu): win 10 x64

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