Fix test failures

Signed-off-by: JCW <a1q123456@users.noreply.github.com>

include/xrpl/ledger/TrustLine.h

@@ -78,21 +78,21 @@ public:
      * @brief Returns the state map key for the ledger entry.
      * @return The key (hash) of the RippleState entry.
      */
-    uint256 const&
+    uint256
     key() const;
 
     /**
      * @brief Get our account ID.
      * @return The account ID from whose perspective this line is viewed.
      */
-    AccountID const&
+    AccountID
     getAccountID() const;
 
     /**
      * @brief Get the peer's account ID.
      * @return The account ID of the other party on this trust line.
      */
-    AccountID const&
+    AccountID
     getAccountIDPeer() const;
 
     /**

src/libxrpl/ledger/TrustLine.cpp

@@ -40,20 +40,20 @@ TrustLine::getItems(AccountID const& accountID, ReadView const& view, LineDirect
     return items;
 }
 
-uint256 const&
+uint256
 TrustLine::key() const
 {
     return rippleState_.getSle()->key();
 }
 
-AccountID const&
+AccountID
 TrustLine::getAccountID() const
 {
     return viewLowest_ ? rippleState_.getLowLimit().getIssuer()
                        : rippleState_.getHighLimit().getIssuer();
 }
 
-AccountID const&
+AccountID
 TrustLine::getAccountIDPeer() const
 {
     return !viewLowest_ ? rippleState_.getLowLimit().getIssuer()