(Reuters) -TripAdvisor can proceed with its planned move to Nevada but shareholders can seek damages, a Delaware judge ruled on Tuesday in a case billionaire Elon Musk highlighted as an attempt to "lock the doors" on firms leaving the state. Two shareholders had sued directors at TripAdvisor and its parent company last year and asked the court to block the move, claiming it was designed to benefit Greg Maffei, CEO of parent company Liberty TripAdvisor, at their expense. They argued it would let Maffei, the online travel advice site's controlling stockholder, avoid accountabili...