fix: calendar month change icons not showing in 2021.11 beta

[regevbr]

Breaking changes made recently to the frontend, specifically in the ha-icon-button element, causes some buttons to not show up. This PR fixes that issue while maintaining backward compatibility.
You can see the breaking changes here:

https://github.com/home-assistant/frontend/blob/master/src/components/ha-icon-button.ts#L10-L11

home-assistant/frontend@0c940be#diff-b7749fac30d4d29a769a04d77d9e72093cfdfecd6e325fba66649575229bde9c

i.e I'm using the latest beta version of HA that was released a couple of hours ago

How has this been tested

Ran on my local hass

Types of changes

• Docs change / refactoring.
• Non-breaking change (fix or feature that wouldn't cause existing functionality to change/break).
• Breaking change (fix or feature that would cause existing functionality to change/break).

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes don't generate new warnings.
• I have read the CONTRIBUTING document.
• I have added tests that prove my fix is effective or that my feature works.
• All new and existing tests pass.

[regevbr]

@totaldebug can you please CR?

[marksie1988]

Code looks good, please update the version in the pyproject.toml and rebuild npm run build

you may need to merge the upstream changes first as I have recently done another release

[regevbr]

Code looks good, please update the version in the pyproject.toml and rebuild npm run build

you may need to merge the upstream changes first as I have recently done another release

Thanks, I rebased and changed the version in package.json (not pyproject.toml as you, I guess, mentioned by mistake) and then ran the build (so version 5.2.2 is now bundled). Please let me know if there is anything else

[marksie1988]

yes sorry! jumping between js and python...

[regevbr]

yes sorry! jumping between js and python...

haha no worries, thanks for the swift CR :-)