erp5_web_renderjs_ui: do not expand every field's div

Some fields may use div element without expecting 100% width.
Example: formbox and diff gadget.
14 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

02:32:08

passed ERP5.PerformanceTest-Master

00:23:00

failed ERP5.UnitTest-Master

01:31:25

failed ERP5.UnitTest-Master.Medusa

01:44:44

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:26

passed SlapOS.Eggs.UnitTest-Master.Python3

00:30:34

failed ERP5.UnitTest-Master

03:07:07

failed ERP5.UnitTest-Master

01:43:49

passed SlapOS.Eggs.UnitTest-Master.Python2

00:46:33

passed SlapOS.Eggs.UnitTest-Master.Python2

00:34:36

passed SlapOS.Eggs.UnitTest-Master.Python2

00:19:11

passed SlapOS.Eggs.UnitTest-Master.Python3

00:17:57

passed SlapOS.Eggs.UnitTest-Master.Python3

00:33:32

passed SlapOS.Eggs.UnitTest-Master.Python3

00:30:41