Use ilike operator as One2One default search operator

issue10977
review374271002
(grafted from f79d637654a5a47ecb633cc871283f2773954e02)

--HG--
branch : 6.0

src/common.js

@@ -1892,7 +1892,7 @@
         },
         default_operator: function(field) {
             if (~['char', 'text', 'many2one', 'many2many', 'one2many',
-                    'reference'].indexOf(field.type)) {
+                    'reference', 'one2one'].indexOf(field.type)) {
                 return 'ilike';
             } else if (field.type == 'multiselection') {
                 return 'in';