Fix UpdateVsCodeLaunch for main

UpdateVsCodeLaunch uses PsBuildTasks/$PsBuildTaskBranch/VsCode/launch.json which does not exist.

```
ERROR: 404: Not Found
At C:\Users\me\Repos\PsSqlClient\tasks\PsBuild.Tasks.ps1:86 char:5
+     Invoke-WebRequest `
+     ~~~~~~~~~~~~~~~~~~~
At C:\Users\me\Repos\PsSqlClient\tasks\PsBuild.Tasks.ps1:82 char:1
+ task UpdateVsCodeLaunch {
```