fix wrapping classes when targeting ESNext

[Charles (clydin)]

This conforms to the behavior present in the class fields transformer:

TypeScript/src/compiler/transformers/classFields.ts

Lines 70 to 75 in c1f676d

	functiontransformSourceFile(node: SourceFile){
	constoptions=context.getCompilerOptions();
	if(node.isDeclarationFile
	||options.useDefineForClassFields&&options.target===ScriptTarget.ESNext){
	returnnode;
	}

Fixes#38528