minor bug - spout doesn't start sender feed automatically at startup

[Marsic1]

Describe the bug
Upon obs startup, until the scene becomes active at least once, the Spout sender feed is not started

To Reproduce
Steps to reproduce the behavior:

1. Create scene A, Scene B, add spout filter to scene B
2. Select Scene A, feed works fine, close obs and open it again
3. OBS opens up with scene A, there's no spout feed
4. As soon as i click scene B feed becomes active and available, i can then move to any other scene, everything works correctly

Expected behavior
if spout filter is active on a scene (or a source) it should activate automatically upon obs startup and not wait until the scene/source becomes active at least once

About the Software:

• OBS Version - 31.0.2
• OBS Spout 2 Source Plugin Version - tried with latest buid and previous build

About Your Machine :

• OS: Windows 11
• GPU RTX3090
• NVidia Driver Version 572.83 Studio Drivers
• RAM 128GB
• Machine Type Desktop
• Battery Mode N/A