Fix "Save as Draft" for lab Funds (#3573)

Allow lab to be saved as draft without filling in the required fields.
Right now, if the lab is saved as draft it is validated for the required
fields.

Fixes https://github.com/HyphaApp/hypha/issues/3555

hypha/apply/funds/models/applications.py

@@ -584,8 +584,9 @@ class LabBase(EmailForm, WorkflowStreamForm, SubmittableStreamForm):  # type: ig
         return self.live
 
     def get_form(self, *args, **kwargs):
+        draft = kwargs.pop("draft", False)
         user = kwargs.get("user")
-        form_class = self.get_form_class(user=user)
+        form_class = self.get_form_class(draft=draft, user=user)
         form_params = self.get_form_parameters()
         form_params.update(kwargs)
 
@@ -599,10 +600,10 @@ class LabBase(EmailForm, WorkflowStreamForm, SubmittableStreamForm):  # type: ig
             )
 
         if request.method == "POST":
+            draft = request.POST.get("draft", False)
             form = self.get_form(
-                request.POST, request.FILES, page=self, user=request.user
+                request.POST, request.FILES, page=self, user=request.user, draft=draft
             )
-            draft = request.POST.get("draft", False)
             if form.is_valid():
                 form_submission = SubmittableStreamForm.process_form_submission(
                     self, form, draft=draft