fix Doctrine2 error "Invalid parameter format" in seeInRepository method...

seeInRepository assertion is failed incorrectly, 
when second argument has a column name starting with '_'.

For example:
```
        $I->seeInRepository(
            "Entity\User",
            array(                                      
                '_id' => 1
            )
        );
```
Output error after functional test is below:
```
Sorry, I couldn't see in repository "Entity\User",{"_id":1}:
Doctrine\ORM\Query\QueryException: Invalid parameter format, : given, but :<name> or ?<num> expected.
```

I fixed it.