Fix z-index of notification icon on custom_card_paddy_waste_collection

[photomoose]

Additional information

• This PR fixes or closes issue: fixes Custom-card "Waste collection" - Alert is displayed behind the text #897
• This PR is related to issue:
• Link to documentation pull request:

Added z-index to notification icon so that it appears on top of the waste icon.

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• I have followed the contribution guidelines
  • This PR is for a custom-card or documentation change and therefore directed to the main branch.
  • This PR is for a official card or any other directly to the integration related change and therefore directed to the release branch.