fix: align datagrid WidgetObject boolean defaults with PropertyType schema

Refs: mendixlabs#541 — final CE0463 gap closed

The embedded datagrid.json template had two WidgetObject Boolean property
values that didn't match their PropertyType.ValueType.DefaultValue:

  Property           Schema default   Stored value (wrong)
  ─────────────────  ──────────────   ────────────────────
  columnsFilterable  'true'           'false'
  sortable           'true'           'false'

Studio Pro detects this as the widget definition being "out of sync" and
emits CE0463 ("The definition of this widget has changed") on every
DataGrid widget instance in the project.

Fixed by setting WidgetObject's stored PrimitiveValue to match the schema
default. Audited all 30 embedded templates; datagrid.json was the only
one with Boolean-property default mismatches.

Result: all 7 CE0463 errors in the v0.10 fixture are eliminated. Remaining
errors (4 total) are unrelated to widget templates:
  - 2× CE0106  Microflow security (pre-existing project errors)
  - 1× CE0720  Placeholder index in dgDyn ContentParams (MDL issue)
  - 1× CE7410  Button action page param type mismatch (MDL issue)

Cumulative CE0463 fixes landed across 4 commits:
  ec99cdff  Added AllowUpload field to WidgetValueType BSON
  b1f4de3a  Reordered WidgetObject.Properties to match PropertyTypes order
  7e6fee84  Added required CustomWidget envelope fields to filter widgets
  f9818394  Populated TextTemplate translation defaults + Editable=Always
  THIS      Aligned Boolean property defaults

End-to-end verification (v0.10 fixture #31): zero CE0463 errors on any
DataGrid widget after `mxcli widget init` + `mxcli exec` on a fresh
Mendix 11.9 project. Filter widgets, custom-content columns, controlbar
buttons all open cleanly in Studio Pro.

Methodology that closed CE0463: `mx dump-mpr` diff of mxcli output vs
Studio-Pro-emitted reference, focused per-widget via UUID normalization.
The before/after-Studio-Pro-Update-Widget diff isolated which fields
Studio's canonical form requires.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ako

sdk/widgets/templates/mendix-11.6/datagrid.json

@@ -5914,7 +5914,7 @@
                     "Objects": [
                       2
                     ],
-                    "PrimitiveValue": "false",
+                    "PrimitiveValue": "true",
                     "Selection": "None",
                     "SourceVariable": null,
                     "TextTemplate": null,
@@ -6362,7 +6362,7 @@
           "Objects": [
             2
           ],
-          "PrimitiveValue": "false",
+          "PrimitiveValue": "true",
           "Selection": "None",
           "SourceVariable": null,
           "TextTemplate": null,