Upload Wizard: Add double click support

Add support to select the document type using a Double Click action
on the form.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/sources/wizards.py

@@ -160,6 +160,7 @@ class DocumentCreateWizard(SessionWizardView):
         wizard_step = WizardStep.get(name=self.steps.current)
 
         context.update({
+            'form_css_classes': 'form-hotkey-double-click',
             'step_title': _(
                 'Step %(step)d of %(total_steps)d: %(step_label)s'
             ) % {