Remove superfluous @JvmStatic annotation. (#2832)

This annotation was applied because of a misunderstanding of what it actually did.

core/src/main/kotlin/net/corda/core/transactions/LedgerTransaction.kt

@@ -51,7 +51,6 @@ data class LedgerTransaction @JvmOverloads constructor(
     }
 
     private companion object {
-        @JvmStatic
         private fun createContractFor(className: ContractClassName, classLoader: ClassLoader?): Try<Contract> {
             return Try.on {
                 (classLoader ?: this::class.java.classLoader)