purchaseTor returns true if player already has tor

Change `purchaseTor` to return `true` if the player already has purchased Tor. Previously it would return `false`

Changing this to true puts the behavior inline with the already existing behavior of `purchaseProgram`, which returns true if you have already purchased the program. Additionally this lets us call `purcahseTor` with the same logic that we use to call `purchaseProgram`

src/NetscriptFunctions/Singularity.ts

@@ -499,7 +499,7 @@ export function NetscriptSingularity(
 
       if (player.hasTorRouter()) {
         workerScript.log("purchaseTor", () => "You already have a TOR router!");
-        return false;
+        return true;
       }
 
       if (player.money < CONSTANTS.TorRouterCost) {