[Bug] Modern template does not read the value of "tocFilter" in local storage.

[AnalogFeelings]

Describe the bug
The TOC filter bar stores its content inside "tocFilter" in the local storage, most likely to load it back in on page reload, like the older versions did.

To Reproduce
Steps to reproduce the behavior:

1. Go to any page with a TOC
2. Put any filter on the filter bar
3. Click on a page/reload
4. The filter bar is empty

Expected behavior
The filter bar should keep its value by reading the "tocFilter" variable inside local storage on element construction.

Screenshots
None

Context (please complete the following information):

• Browser: Edge (Chromium)
• Form factor: All
• Docfx version: 2.75.2
• Template: modern

Additional context
None