fix text default value produces "'::text'" as value

[artlo]

• [x] Do only one thing
• [ ] Non breaking API changes
• [x] Tested

What did this pull request do?

Fixing incorrect default value in auto generated models.

User Case Description

If DB column definition has column name text default value '' then the generated model will have the Go tag: default:"''::text" and value ''::text will be written to DB column as default value.