game-capture: reset hook_stop signal

[FanZR123]

Description

If the game process is hooked successfully, but the game process does not call rendering. The capture_should_stop->capture_stopped of graphics-hook.dll will not be called.
The game plugin will fall into a loop:

Motivation and Context

How Has This Been Tested?

• Add a game capture source
• Capture an application that does not render
• Switch to another mode to stop capturing the application
• Recapture the application

Types of changes

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.

[WizardCM]

Could you provide more exact reproduction steps of the issue? Maybe an name of a game you experienced this with?

[FanZR123]

Could you provide more exact reproduction steps of the issue? Maybe an name of a game you experienced this with?

You can use Zoom to test

1. Start a new meeting in Zoom
2. Add the game source in OBS and capture Zoom
3. End the meeting in Zoom

In addition, this problem has been encountered in Warframe and Sacred2, but it is very difficult to reproduce.