contracts-bedrock: fix naming, update snapshot

packages/contracts-bedrock/.gas-snapshot

@@ -379,7 +379,8 @@ SequencerFeeVault_Test:test_minWithdrawalAmount_succeeds() (gas: 5420)
 SequencerFeeVault_Test:test_receive_succeeds() (gas: 17336)
 SequencerFeeVault_Test:test_withdraw_notEnough_reverts() (gas: 9309)
 SequencerFeeVault_Test:test_withdraw_succeeds() (gas: 159816)
-SystemConfig_Initialize_TestFail:test_initialize_lowGasLimit_reverts() (gas: 61707)
-SystemConfig_Setters_TestFail:test_setBatcherHash_notOwner_reverts() (gas: 10501)
-SystemConfig_Setters_TestFail:test_setGasConfig_notOwner_reverts() (gas: 10576)
-SystemConfig_Setters_TestFail:test_setGasLimit_notOwner_reverts() (gas: 10592)
+SystemConfig_Initialize_TestFail:test_initialize_lowGasLimit_reverts() (gas: 61966)
+SystemConfig_Setters_TestFail:test_setBatcherHash_notOwner_reverts() (gas: 10523)
+SystemConfig_Setters_TestFail:test_setGasConfig_notOwner_reverts() (gas: 10510)
+SystemConfig_Setters_TestFail:test_setGasLimit_notOwner_reverts() (gas: 10614)
+SystemConfig_Setters_TestFail:test_setUnsafeBlockSigner_notOwner_reverts() (gas: 10638)

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

@@ -26,7 +26,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         BATCHER,
         GAS_CONFIG,
         GAS_LIMIT,
-        UNSAFE_BLOCK_KEY
+        UNSAFE_BLOCK_SIGNER
     }
 
     /**
@@ -155,7 +155,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         unsafeBlockSigner = _unsafeBlockSigner;
 
         bytes memory data = abi.encode(_unsafeBlockSigner);
-        emit ConfigUpdate(VERSION, UpdateType.UNSAFE_BLOCK_KEY, data);
+        emit ConfigUpdate(VERSION, UpdateType.UNSAFE_BLOCK_SIGNER, data);
     }
 
     /**

packages/contracts-bedrock/contracts/test/SystemConfig.t.sol

@@ -106,7 +106,7 @@ contract SystemConfig_Setters_Test is SystemConfig_Init {
         vm.expectEmit(true, true, true, true);
         emit ConfigUpdate(
             0,
-            SystemConfig.UpdateType.UNSAFE_BLOCK_KEY,
+            SystemConfig.UpdateType.UNSAFE_BLOCK_SIGNER,
             abi.encode(newUnsafeSigner)
         );