Tiny cleanup to SafetyChecker (#262)

Co-authored-by: Mark Tyneway <mark.tyneway@gmail.com>

packages/contracts/contracts/optimistic-ethereum/OVM/execution/OVM_SafetyChecker.sol

@@ -22,6 +22,7 @@ contract OVM_SafetyChecker is iOVM_SafetyChecker {
     /********************
      * Public Functions *
      ********************/
+
     /**
      * Returns whether or not all of the provided bytecode is safe.
      * @param _bytecode The bytecode to safety check.
@@ -33,7 +34,9 @@ contract OVM_SafetyChecker is iOVM_SafetyChecker {
         override
         external
         pure
-        returns (bool)
+        returns (
+            bool
+        )
     {
         // autogenerated by gen_safety_checker_constants.py
         // number of bytes to skip for each opcode