Terminal suggest: git branch -D doesn't give completions

[Tyriar]

Repro:

1. Open terminal
2. Type git branch -D t
3. Ctrl+space to request completions, 🐛 only --remotes shows but all branches should show as candidates to delete

Code pointer: https://github.com/microsoft/vscode/blob/61f1c115ad49b3e5eb1b5474006e80ef290a6842/extensions/terminal-suggest/src/completions/git.ts

[Tyriar]

Can't repro in oss 🤔

[Tyriar]

Latest insiders should have #260749

Insiders:

OSS: