[FIX] crm: columns and tables in upper cases

The module studio gives the abality to name columns or tables with
upper cases. So making the SQL case sensitive avoids problems with studio.

opw:770022

addons/crm/wizard/base_partner_merge.py

@@ -199,7 +199,7 @@ class MergePartnerAutomatic(models.TransientModel):
                 except psycopg2.Error:
                     # updating fails, most likely due to a violated unique constraint
                     # keeping record with nonexistent partner_id is useless, better delete it
-                    query = 'DELETE FROM %(table)s WHERE %(column)s IN %%s' % query_dic
+                    query = 'DELETE FROM "%(table)s" WHERE "%(column)s" IN %%s' % query_dic
                     self._cr.execute(query, (tuple(src_partners.ids),))
 
     @api.model