MINOR ISSUE: Context menu Stop with a multiple selection only stops one encode

### Problem Description

With 4 encodes running, I selected 2 of them, and used the right-click context menu to Stop them.   
Only the 1st selected encode was then stopped. The 2nd continued running. 100% reproducible.
It's a minor issue with an easy work-around. Just FYI.

### What version of VidCoder are you running?

12.14 VelopackInstaller

### Encode Log

```text

```