Keys with escaped quotes within are not highlighted correctly

[JiFish]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: https://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: https://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

Keys with escaped quotes within are not highlighted correctly. Both single and double quotes are effected.

Steps to Reproduce

1. Create a key with an escaped quote of the same type as surrounds the key.

Expected behavior:

It should highlight the same as any other key, and it's value should highlight if it's a number/bool etc.

Actual behavior:

No highlighting is applied

Reproduces how often:
Always

Versions

Atom    : 1.60.0
Electron: 9.4.4
Chrome  : 83.0.4103.122
Node    : 12.14.1

apm  2.6.2
npm  6.14.13
node 12.14.1 x64
atom 1.60.0
python 2.7.14
git 2.16.2.windows.1
visual studio

Additional Information