Fix browser freezing when executing child debug

Fixes an infinite loop that was triggered when attempting
to resolve a parent console.

Signed-off-by: Alvaro Sanchez-Leon <alvaro.sanchez-leon@ericsson.com>

packages/debug/src/browser/debug-session.tsx

@@ -834,7 +834,7 @@ export class DebugSession implements CompositeTreeElement {
         }
         let debugSession: DebugSession | undefined = this;
         do {
-            debugSession = this.parentSession;
+            debugSession = debugSession.parentSession;
         } while (debugSession?.parentSession && debugSession.configuration.consoleMode === DebugConsoleMode.MergeWithParent);
         return debugSession;
     }