fixbug with eager root where

[sqlwwx]

fixbug

buildFilter(Person)
  .build({
    eager: {
      $where: {
        id: {
          $gt: 0
        },
        'pets.name': 'P90'
      }
     }
   })
eager object notation sqlite3 root model using related fields should filter using root field:
     select `Person`.* from `Person` inner join (select distinct `Person`.`id` from `Person` inner join `Animal` as `pets` on `pets`.`ownerId` = `Person`.`id` where (`id` > 0 and `pets`.`name` = 'P90')) a
s `filter_query` on `Person`.`id` = `filter_query`.`id` - SQLITE_ERROR: ambiguous column name: id

[coveralls]

Coverage increased (+0.02%) to 98.165% when pulling 8d91c6b on sqlwwx:fixbug/eager into 207bacf on tandg-digital:master.

[jeff3yan]

Thanks for the pull request. I overlooked the case with ambiguous column names. I'll review it shortly but overall looks good.