Fix ligature issue in ACE

[snide]

Summary

@bmcconaghy noticed some issues with console and tracked to down to a Kibana upgrade of EUI from 6.3.1 to 6.5.1. I picked up the trail and tracked it down to these lines

https://github.com/elastic/eui/blob/master/src/global_styling/mixins/_typography.scss#L12
https://github.com/elastic/eui/blob/master/src/global_styling/variables/_typography.scss#L30

I don't think this is a problem with the code in EUI but a weird bug in ACE and the way they calculate cursor position based off character widths. Unfortunately we use ACE everywhere in Kibana and I'd rather cut this off here than add a lot of overwrites into our ACE implementation there. I'll be honest and say I don't know enough about this property to understand much of what it does other than effect kerning. I couldn't notice any difference in the render, but I have old eyes 😄

Checklist

• This was checked in mobile
• This was checked in IE11
• This was checked in dark mode
• Any props added have proper autodocs
• Documentation examples were added
• A changelog entry exists and is marked appropriately
• This was checked for breaking changes and labeled appropriately
• Jest tests were updated or added to match the most common scenarios
• This was checked against keyboard-only and screenreader scenarios
• This required updates to Framer X components

[cchaos]

Thanks for adding the comment in there too