Fix scroll restoration

[PaperStrike]

• Revert Fix the problem that scroll position can't restored at page refresh after PJAX enabled. #74 since Restore scroll position on reload pjax#4.

PR Checklist

• The commit message follows guidelines for NexT.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for features).

PR Type

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

See #74.

Issue resolved:

What is the new behavior?

See next-theme/pjax#4.

• Link to demo site with this changes:
• Screenshots with this changes:

How to use?

In NexT _config.yml:

[coveralls]

Coverage remained the same at 92.469% when pulling aa3b2fb on PaperStrike:scroll-reload into 17bd19d on next-theme:master.