win-dshow: Fix virtualcam output a default video format

[exeldro]

Description

Fix virtualcam output a default video format Depends on: https://github.com/obsproject/libdshowcapture/pull/50

Motivation and Context

The virtual camera indicates it supports a resolution that is not the resolution of the output. This makes apps like vdo.ninja use the wrong resolution, which results in stretched images.

How Has This Been Tested?

On windows 64bit with a virtual camera and vdo.ninja

Types of changes

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

Checklist:

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

[RytoEX]

Marking as Draft only to indicate that it depends on another PR. Might need someone else to look into the libdshowcapture PR.