Refs #23079. Directors only necessary when there are interfaces.

Signed-off-by: Miguel Company <miguelcompany@eprosima.com>

Author: MiguelCompany

src/main/java/com/eprosima/fastcdr/idl/templates/TypesSwigInterface.stg

@@ -20,7 +20,7 @@ import "FastCdrCommon.stg"
 main(ctx, definitions) ::= <<
 $fileHeader(ctx=ctx, file=[ctx.filename, ".i"], description=["This header file contains the SWIG interface of the described types in the IDL file."])$
 
-%module($if(ctx.thereIsInterface)$threads="1",$endif$directors="1",moduleimport="if __import__('os').name == 'nt': import win32api; win32api.LoadLibrary('$ctx.filename$.dll')\nif __package__ or '.' in __name__:\n    from . import _$ctx.filename$Wrapper\nelse:\n    import _$ctx.filename$Wrapper") $ctx.filename$
+%module($if(ctx.thereIsInterface)$threads="1",directors="1",$endif$moduleimport="if __import__('os').name == 'nt': import win32api; win32api.LoadLibrary('$ctx.filename$.dll')\nif __package__ or '.' in __name__:\n    from . import _$ctx.filename$Wrapper\nelse:\n    import _$ctx.filename$Wrapper") $ctx.filename$
 
 $if(ctx.thereIsInterface)$
 // We have enabled threads because the RPC server directors will call the target language environment