Un-configure repos when initializing

An error occurs when initializing (running `script/initial_app_setup.rb`)

```
$ ./script/initial_app_setup.rb 
* Dependency create mysql barkeep database is not met. Meeting it.
* Dependency run task once: database migrations is not met. Meeting it.
/home/s1n4/Code/barkeep/lib/models.rb:4: warning: already initialized constant DB
Error: Sequel::DatabaseError: Mysql2::Error: Table 'barkeep.git_repos' doesn't exist.../gems/sequel-3.36.1/lib/sequel/adapters/mysql2.rb:89:in `query'
.../gems/sequel-3.36.1/lib/sequel/adapters/mysql2.rb:89:in `query': Mysql2::Error: Table 'barkeep.git_repos' doesn't exist (Sequel::DatabaseError)
	from .../gems/sequel-3.36.1/lib/sequel/adapters/mysql2.rb:89:in `block in _execute'
	from .../gems/sequel-3.36.1/lib/sequel/database/logging.rb:33:in `log_yield'
	from .../gems/sequel-3.36.1/lib/sequel/adapters/mysql2.rb:89:in `_execute'
	from .../gems/sequel-3.36.1/lib/sequel/adapters/shared/mysql_prepared_statements.rb:23:in `block in execute'
	from .../gems/sequel-3.36.1/lib/sequel/database/connecting.rb:229:in `block in synchronize'
	from .../gems/sequel-3.36.1/lib/sequel/connection_pool/threaded.rb:105:in `hold'
	from .../gems/sequel-3.36.1/lib/sequel/database/connecting.rb:229:in `synchronize'
	from .../gems/sequel-3.36.1/lib/sequel/adapters/shared/mysql_prepared_statements.rb:23:in `execute'
	from .../gems/sequel-3.36.1/lib/sequel/dataset/actions.rb:744:in `execute'
	from .../gems/sequel-3.36.1/lib/sequel/adapters/mysql2.rb:171:in `execute'
	from .../gems/sequel-3.36.1/lib/sequel/adapters/mysql2.rb:147:in `fetch_rows'
	from .../gems/sequel-3.36.1/lib/sequel/dataset/actions.rb:131:in `each'
	from .../gems/sequel-3.36.1/lib/sequel/dataset/actions.rb:515:in `single_record'
	from .../gems/sequel-3.36.1/lib/sequel/dataset/actions.rb:188:in `first'
	from .../gems/sequel-3.36.1/lib/sequel/model/base.rb:307:in `find'
	from .../gems/sequel-3.36.1/lib/sequel/model/base.rb:323:in `find_or_create'
	from /home/s1n4/Code/barkeep/lib/meta_repo.rb:47:in `block in load_repos'
	from /home/s1n4/Code/barkeep/lib/meta_repo.rb:44:in `each'
	from /home/s1n4/Code/barkeep/lib/meta_repo.rb:44:in `load_repos'
	from /home/s1n4/Code/barkeep/lib/meta_repo.rb:31:in `initialize'
	from /home/s1n4/Code/barkeep/lib/meta_repo.rb:22:in `new'
	from /home/s1n4/Code/barkeep/lib/meta_repo.rb:22:in `configure'
	from /home/s1n4/Code/barkeep/lib/script_environment.rb:26:in `<top (required)>'
	from script/create_demo_user.rb:9:in `require'
	from script/create_demo_user.rb:9:in `<main>'
```

It happens while `REPOS_ROOT` directory is existing with some repo, so repos configuration causes that.