[EuiSuperDatePicker] showUpdateButton="iconOnly" shows the whole text in the refresh button.

[afgomez]

Basically what the title says. When using <EuiSuperDatePicker showUpdateButton="iconOnly" /> I would expect only the 🔄 icon to show, but instead it shows the whole text.

It can be reproduced in the documentation example

[cee-chen]

@breehall Do you have time after the Kibana upgrade (or between CI runs) to take a look at this issue?

[cee-chen]

@afgomez Just wanted to say huge thanks for opening this issue - it helped us preemptively catch several bugs before the EuiButton Emotion work landed in Kibana. You rock!! :)