fix(#216): FzButton not showing icon when only iconName is set

[giuliowaitforitdavide]

Jira: HD-11175

Closes #216

[Crish15]

Thanks for the pr.
Few things:
1- You should increase the package version inside package.json.
2- You should publish the build of chromatic by running the script “chromatic” inside the file `apps/storybook/package.json

[giuliowaitforitdavide]

Thanks for the pr. Few things: 1- You should increase the package version inside package.json. 2- You should publish the build of chromatic by running the script “chromatic” inside the file `apps/storybook/package.json

I also published the build on chromatic @Crish15