Format .eslintignore

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.0.X, 7.1.X, 7.2.X, 7.3.6 CE GA7, 7.3.X
• Component/s: NPM Tools
• Labels:
  • 7010-sp-pending
  • 7110-sp-pending
  • 7210-sp-pending
  • 7310-sp-pending
• Branch Version/s:
  7.3.x, 7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Sprint: S04E08 - 3Fs, S04E09 - Transistor OST
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/97841

I just noticed that .eslintignore has mixed indentation in it, and furthermore, that we are already have auto-formatting for .prettierignore which we can reuse.