(Bug): Undo unplugs the wrong connection to the same node

[HeCorr]

Make sure to follow our issue report guidelines

• [X] I'm using the latest version of Natron (not required but recommended)
• [X] I've restarted Natron and the issue persists
• [ ] I've run Natron via the command line and the issue persists
• [X] I've followed the contributing guidelines to the best of my understanding
• [X] My issue is not on the issue tracker or in a pull request already (go search for it and dig around a little bit!)
• [X] This bug is reproducible

Natron version

Natron version 2.4.3 Release

Operating system

Windows 10 Pro [1909]

System specs

RAM: 32GB CPU: AMD Ryzen 7 3700x GPU: NVidia RTX 3060

Did you install Natron using the official installer?

• [X] Yes, I used the official installer
• [ ] No, I installed from a binary archive
• [ ] No, I compiled Natron from sources
• [ ] No, I installed Natron via another method

Custom installation path

No response

What were you trying to do?

Undo a mistaken duplicate node connection (node A connected twice to node B via two connections)

What did you expect to happen? What happened instead?

Instead of disconnecting the last connected input (i.e. Mask) and keeping the original connection (i.e. input A), it disconnected input A and left the Mask input connected.

Here's a video demonstrating the issue:

https://user-images.githubusercontent.com/75134774/196042294-9cba389a-c30e-4170-be0a-3c02914bb2ad.mp4

Step-by-step reproduction instructions

1. Start Natron
2. Add any node (Constant should work)
3. Add a Merge node
4. Connect Merge's A input into the first node
5. Connect Merge's Mask input into the same node
6. Undo.

Additional details

No response