Add missing template tags to KButton

[marcellamaki]

Description

This replace the <template /> tags which were needed in the KButton code in order for the refactored KDropdownMenu to work correctly. I think I accidentally dropped them during rebase.

Issue addressed

Addresses learningequality/kolibri#9754

Steps to test

Please see corresponding Kolibri PR to test in Kolibri

Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical and brittle code paths are covered by unit tests
• The change has been added to the changelog

Reviewer guidance

• Is the code clean and well-commented?
• Are there tests for this change?
• Are all UI components LTR and RTL compliant (if applicable)?
• Add other things to check for here

Post-merge updates and tracking

• Learning Platform update PR is submitted
• Learning Platform update PR is merged
• Studio update PR is submitted
• Studio update PR is merged
• Data Portal update PR is submitted
• Data Portal update PR is merged

Comments

[nucleogenesis]

Looks great