Properly fix #133687

[jeanp413]

This PR fixes #133687

@meganrogge sorry for bothering you again but 54ab46f caused a regression when creating terminals using the location API location: {parentTerminal} from an extension

const terminal1 = vscode.window.createTerminal({ name: `Term 1` });
terminal1.show();

const terminal2 = vscode.window.createTerminal({ name: `Term 2` });
terminal2.show();

const terminal3 = vscode.window.createTerminal({ name: `Term 3`, location: {parentTerminal: terminal2} });
terminal3.show();

Running this will create all three terminal in a single group (the panel must be hidden initially)