Sort correclty eager and lazy fields when calling Form.display

Closes #12890
(grafted from 60a0e087ead74ae2c242c33f56977f466d3874be)

--HG--
branch : 6.0

sao/src/view/form.js

@@ -288,7 +288,7 @@ function eval_pyson(value){
                     field = record.model.fields[fname];
                     fields.push([
                         fname,
-                        field.description.loading || 'eager' == 'eager',
+                        (field.description.loading || 'eager') == 'eager',
                         field.views.size,
                     ]);
                 });