obs-filters: Maintain order of migrated NVAFX filters

[pkviet]

Description

This fixes a bug where the NVIDIA NVAFX filters are migrated but not kept in their original order, with respect to other filters.

Motivation and Context

Fixes a bug.
The bug was noticed by @Penwy whom I thank for the info.

How Has This Been Tested?

Tested on windows 11 pro 24H2, with an RTX 4090 GPU.
The filter order is kept during migration of NVIDIA audio FX.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[RytoEX]

The commit message should use a verb as the first word:

obs-filters: Maintain order of migrated NVAFX filters

If you've tested this for various filter placements (first, last, middle of 3, middle of more than 3), then this seems fine.

[pkviet]

The commit message should use a verb as the first word:

obs-filters: Maintain order of migrated NVAFX filters

Done

If you've tested this for various filter placements (first, last, middle of 3, middle of more than 3), then this seems fine.

yeah, tested in orders 1, 2, 3 & 4 in a set of 4 filters; works fine.