fix: simplified code for SystemConfig code (#17539)

Author: smartcontracts

packages/contracts-bedrock/snapshots/semver-lock.json

@@ -44,8 +44,8 @@
     "sourceCodeHash": "0xbf344c4369b8cb00ec7a3108f72795747f3bc59ab5b37ac18cf21e72e2979dbf"
   },
   "src/L1/SystemConfig.sol:SystemConfig": {
-    "initCodeHash": "0x43b5fc9ca19b5f34623b7b6cc5d71f56153fe4b8f1930cad9d946d2471b2395c",
-    "sourceCodeHash": "0xa82f3f62be32f9f9988b2b44d740c8cbeec3f7623c29c4b7401d0f257e58279e"
+    "initCodeHash": "0x61d7234395adb2c91bd6714b2c5616bb5d5e5ba74e36b1a95d9f3e959eb41e50",
+    "sourceCodeHash": "0x53300cd4e69d0f6068fc47b8dc1ffcb566cb957eba9409226ee51e1b96c0afe3"
   },
   "src/L2/BaseFeeVault.sol:BaseFeeVault": {
     "initCodeHash": "0x9b664e3d84ad510091337b4aacaa494b142512e2f6f7fbcdb6210ed62ca9b885",

packages/contracts-bedrock/src/L1/SystemConfig.sol

@@ -161,9 +161,9 @@ contract SystemConfig is ProxyAdminOwnedBase, OwnableUpgradeable, Reinitializabl
     error SystemConfig_InvalidFeatureState();
 
     /// @notice Semantic version.
-    /// @custom:semver 3.8.0
+    /// @custom:semver 3.9.0
     function version() public pure virtual returns (string memory) {
-        return "3.8.0";
+        return "3.9.0";
     }
 
     /// @notice Constructs the SystemConfig contract.
@@ -507,7 +507,7 @@ contract SystemConfig is ProxyAdminOwnedBase, OwnableUpgradeable, Reinitializabl
 
         // As a sanity check, prevent users from enabling the feature if already enabled or
         // disabling the feature if already disabled. This helps to prevent accidental misuse.
-        if ((_enabled && isFeatureEnabled[_feature]) || (!_enabled && !isFeatureEnabled[_feature])) {
+        if (_enabled == isFeatureEnabled[_feature]) {
             revert SystemConfig_InvalidFeatureState();
         }