When we updated the fonts in the sddm-theme, we bumped the default size from 9pt to 10pt. We missed adding the relevant code to the virtual keyboard button so it remained 9pt. This patch brings it up to 10pt.
Thanks for the quick review everyone :)
They way we set it up now is that there is a hierarchy among font sizes and these buttons are the bottom had low priority. But 11pt would also be legitimate. From 5.17 the user should be able to have their own font size so we'll remove all this hardcoding.