fix(ctb): move inits under constructors

Standardizes the location of initializers to be under constructors.

.changeset/friendly-rats-scream.md

+---
+'@eth-optimism/contracts-bedrock': patch
+---
+
+Moves initializers underneath constructors always

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

@@ -99,6 +99,14 @@ contract OptimismPortal is Initializable, ResourceMetering, Semver {
         initialize();
     }
 
+    /**
+     * @notice Initializer;
+     */
+    function initialize() public initializer {
+        l2Sender = DEFAULT_L2_SENDER;
+        __ResourceMetering_init();
+    }
+
     /**
      * @notice Accepts value so that users can send ETH directly to this contract and have the
      *         funds be deposited to their address on L2. This is intended as a convenience
@@ -214,14 +222,6 @@ contract OptimismPortal is Initializable, ResourceMetering, Semver {
         return _isOutputFinalized(proposal);
     }
 
-    /**
-     * @notice Initializer;
-     */
-    function initialize() public initializer {
-        l2Sender = DEFAULT_L2_SENDER;
-        __ResourceMetering_init();
-    }
-
     /**
      * @notice Accepts deposits of ETH and data, and emits a TransactionDeposited event for use in
      *         deriving deposit transactions. Note that if a deposit is made by a contract, its