Fix to bug in atk/src/Relations/ManyToOneTreeRelation.php

[jgarifuna]

    # in edit() method:
        # to avoid ambiguity error
        change:
            $recordset = $this->m_destInstance->select($this->m_destInstance->m_primaryKey[0])->includes($tmp2)->getAllRows(); // original

        to:
            $recordset = $this->m_destInstance->select($this->m_destInstance->getTable() . '.' . $this->m_destInstance->m_primaryKey[0])->includes($tmp2)->getAllRows(); // by Jorge Garifuna

        # to have the correct selected value in the drop down list
        change:             
            $this->m_current = $this->m_ownerInstance->primaryKey($record); // original

        to:
            $this->m_current = $this->m_ownerInstance->primaryKey($record[$this->fieldName()]); // by Jorge Garifuna