pars_info_bind_id() unnecessarily copies strings

The function pars_info_bind_id() is unnecessarily copying string keys. Not only is the parameter copy_name always being passed as nonzero, but that parameter could actually have always been specified as zero. For all calls except one, a compile-time constant string is being passed as a parameter. For the call in fts_get_select_columns_str() and fts_doc_fetch_by_doc_id(), the passed string will already be allocated from the same memory heap that pars_info_bind_id() is using.