Make some confusing/weird Calendar fields not configurable on custom EditEngine forms

Summary:
Ref T11816.

  - Host gets weird behavior around defaulting to the viewer.
  - Invitees get weird behavior around defaulting to the viewer.
  - "All Day" is just sort of weird since start / end date aren't customizable.
  - Recurring/Frequency are weird here and don't make much sense.

I can't immediately come up with reasons that any of these are particularly useful/valuable to default. More of them can be made editable after T10222 gets sorted out.

Test Plan: Edited edit engine custom forms for Calendar events, saw a more sensible list of customizable fields (e.g., policy stuff).

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11816

Differential Revision: https://secure.phabricator.com/D16878

src/applications/calendar/editor/PhabricatorCalendarEventEditEngine.php

@@ -108,6 +108,8 @@ final class PhabricatorCalendarEventEditEngine
         ->setConduitTypeDescription(pht('New event name.'))
         ->setValue($object->getName()),
       id(new PhabricatorBoolEditField())
+        ->setIsLockable(false)
+        ->setIsDefaultable(false)
         ->setKey('isAllDay')
         ->setOptions(pht('Normal Event'), pht('All Day Event'))
         ->setAsCheckbox(true)
@@ -151,6 +153,8 @@ final class PhabricatorCalendarEventEditEngine
         ->setConduitTypeDescription(pht('True to cancel the event.'))
         ->setValue($object->getIsCancelled()),
       id(new PhabricatorUsersEditField())
+        ->setIsLockable(false)
+        ->setIsDefaultable(false)
         ->setKey('hostPHID')
         ->setAliases(array('host'))
         ->setLabel(pht('Host'))
@@ -162,6 +166,8 @@ final class PhabricatorCalendarEventEditEngine
         ->setConduitTypeDescription(pht('New event host.'))
         ->setSingleValue($object->getHostPHID()),
       id(new PhabricatorDatasourceEditField())
+        ->setIsLockable(false)
+        ->setIsDefaultable(false)
         ->setIsHidden($is_future)
         ->setKey('inviteePHIDs')
         ->setAliases(array('invite', 'invitee', 'invitees', 'inviteePHID'))
@@ -203,6 +209,8 @@ final class PhabricatorCalendarEventEditEngine
 
       id(new PhabricatorBoolEditField())
         ->setIsHidden(true)
+        ->setIsLockable(false)
+        ->setIsDefaultable(false)
         ->setKey('isRecurring')
         ->setLabel(pht('Recurring'))
         ->setOptions(pht('One-Time Event'), pht('Recurring Event'))
@@ -213,6 +221,8 @@ final class PhabricatorCalendarEventEditEngine
         ->setConduitTypeDescription(pht('Mark the event as a recurring event.'))
         ->setValue(true),
       id(new PhabricatorSelectEditField())
+        ->setIsLockable(false)
+        ->setIsDefaultable(false)
         ->setKey('frequency')
         ->setLabel(pht('Frequency'))
         ->setOptions($frequency_options)