Change enum rb_parser_ary_data_type default value to 1 for easy debug

We face `[BUG] unexpected rb_parser_ary_data_type (0) for script lines`
on master branch recently.
This commit changes `enum rb_parser_ary_data_type` to start with `1`
and `0` to be invalid then it makes clear `rb_parser_ary_data_type (0)`
is not intentional.

parse.y

@@ -2512,6 +2512,7 @@ parser_ary_new_capa(rb_parser_t *p, long len)
  rb_bug("negative array size (or size too big): %ld", len);
  }
  rb_parser_ary_t *ary = xcalloc(1, sizeof(rb_parser_ary_t));
+ ary->data_type = 0;
  ary->len = 0;
  ary->capa = len;
  if (0 < len) {

rubyparser.h

@@ -224,7 +224,7 @@ typedef struct rb_parser_ast_token {
 typedef void* rb_parser_ary_data;
 
 enum rb_parser_ary_data_type {
- PARSER_ARY_DATA_AST_TOKEN,
+ PARSER_ARY_DATA_AST_TOKEN = 1,
  PARSER_ARY_DATA_SCRIPT_LINE
 };