Encode pty host id into terminal id

Fixes #116948

src/vs/workbench/api/common/extHostTerminalService.ts

@@ -184,6 +184,8 @@ export class ExtHostTerminal {
 }
 
 export class ExtHostPseudoterminal implements ITerminalChildProcess {
+	readonly id = 0;
+
 	private readonly _onProcessData = new Emitter<string>();
 	public readonly onProcessData: Event<string> = this._onProcessData.event;
 	private readonly _onProcessExit = new Emitter<number | undefined>();