Wrong parsing of `CREATE VIEW` if a variable is in the query

`@` symbol is missed from the query after parsing:
```python
from mindsdb_sql_parser import parse_sql

sql = """
create view todel as (select * from local_mysql.test_house where sqft = @myvar);
"""
ast = parse_sql(sql)
print(ast.query_str)
# > select * from local_mysql.test_house where sqft = myvar
```