chore: remove redundant word in comment (#5752)

Author: tzchenxixi

src/xrpld/app/paths/Pathfinder.h

@@ -166,7 +166,7 @@ class Pathfinder : public CountedObject<Pathfinder>
         int addFlags,
         std::function<bool(void)> const& continueCallback);
 
-    // Compute the liquidity for a path.  Return tesSUCCESS if it has has enough
+    // Compute the liquidity for a path.  Return tesSUCCESS if it has enough
     // liquidity to be worth keeping, otherwise an error.
     TER
     getPathLiquidity(