erp5_web_renderjs_ui: precision maybe < 0

https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5/bootstrap/erp5_core/DocumentTemplateItem/portal_components/document.erp5.Amount.py#L426
if base unit price is 69, precision is -2

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_floatfield_js.js

@@ -34,7 +34,7 @@
           id: field_json.key,
           name: field_json.key,
           title: field_json.title,
-          precision: window.parseFloat(field_json.precision),
+          precision: window.parseFloat(field_json.precision > 0 ? field_json.precision : 0),
           // erp5 always put value into "default" (never "value")
           value: window.parseFloat(field_json.default),
           text_content: '',