Fix mod list filter

Fixing problem with filters reported in rP15677.

Use filtered version of mods for manipulation in javascript instead non filtered one.
Fixing following problems when filter is applied:
not enabling selected mod
displaying wrong tooltip
getting out of bounds error when using keyboard arrows to select next/previous mod

This is also disabling possibility to sort enabled mods manually when filters are applied. See comment in moveCurrItem for more details.

Differential Revision: https://code.wildfiregames.com/D1944