contracts: Remove comparison against boolean literal

Author: blukat29

contracts/contracts/service_chain/bridge/BridgeTokens.sol

@@ -40,12 +40,12 @@ contract BridgeTokens is Ownable {
     }
 
     modifier onlyLockedToken(address _token) {
-        require(lockedTokens[_token] == true, "unlocked token");
+        require(lockedTokens[_token], "unlocked token");
         _;
     }
 
     modifier onlyUnlockedToken(address _token) {
-        require(lockedTokens[_token] == false, "locked token");
+        require(!lockedTokens[_token], "locked token");
         _;
     }
 

contracts/contracts/service_chain/bridge/BridgeTransferERC721.sol

@@ -84,7 +84,7 @@ contract BridgeTransferERC721 is BridgeTokens, IERC721BridgeReceiver, BridgeTran
     {
         require(isRunning, "stopped bridge");
         (bool success, bytes memory uri) = _tokenAddress.call(abi.encodePacked(ERC721Metadata(_tokenAddress).tokenURI.selector, abi.encode(_tokenId)));
-        if (success == false) {
+        if (!success) {
             uri = "";
         }
         if (modeMintBurn) {

contracts/contracts/service_chain/bridge/BridgeTransferKLAY.sol

@@ -27,12 +27,12 @@ contract BridgeTransferKLAY is BridgeTransfer, ReentrancyGuard {
     event KLAYUnlocked();
 
     modifier lockedKLAY {
-        require(isLockedKLAY == true, "unlocked");
+        require(isLockedKLAY, "unlocked");
         _;
     }
 
     modifier unlockedKLAY {
-        require(isLockedKLAY == false, "locked");
+        require(!isLockedKLAY, "locked");
         _;
     }