Fix field interactions on OfficeJS' New Support Request dialog

Fixes #20200630-BB32 and #20200630-48F9FA

See merge request !1318
6 jobs for feat/coding_style_form_naming
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:50:18

passed ERP5.PerformanceTest-Master

failed ERP5.UnitTest-Master

01:26:05

passed ERP5.UnitTest-Master.Medusa

01:12:56

passed SlapOS.Eggs.UnitTest-Master.Python2

00:12:24

passed SlapOS.Eggs.UnitTest-Master.Python3