debug: fix parent session badge not hiding correctly

Fixes https://github.com/microsoft/vscode-js-debug/issues/664

src/vs/workbench/contrib/debug/browser/callStackView.ts

@@ -545,7 +545,7 @@ class SessionsRenderer implements ICompressibleTreeRenderer<IDebugSession, Fuzzy
 		};
 		setActionBar();
 		data.elementDisposable.push(this.menu.onDidChange(() => setActionBar()));
-		data.stateLabel.hidden = false;
+		data.stateLabel.style.display = '';
 
 		if (thread && thread.stoppedDetails) {
 			data.stateLabel.textContent = thread.stoppedDetails.description || nls.localize('debugStopped', "Paused on {0}", thread.stoppedDetails.reason || '');
@@ -557,7 +557,7 @@ class SessionsRenderer implements ICompressibleTreeRenderer<IDebugSession, Fuzzy
 			if (!hasChildSessions) {
 				data.stateLabel.textContent = nls.localize({ key: 'running', comment: ['indicates state'] }, "Running");
 			} else {
-				data.stateLabel.hidden = true;
+				data.stateLabel.style.display = 'none';
 			}
 		}
 	}