addAMateButton is incorrectly phetioReadOnly: true

[samreid]

As reported in phetsims/scenery#1676 (comment), the addAMateButton and subsequently its firedEmitter are read-only. However, the code comment indicates that the visibleProperty was meant to be read-only. If I understand correctly, this patch will correct the problem:

Subject: [PATCH] Use PhetioIDUtilsModule, see https://github.com/phetsims/tandem/issues/316
---
Index: js/common/view/PlayButtonGroup.ts
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/js/common/view/PlayButtonGroup.ts b/js/common/view/PlayButtonGroup.ts
--- a/js/common/view/PlayButtonGroup.ts	(revision ff948a96c9fe819eb78591281b69de3729110577)
+++ b/js/common/view/PlayButtonGroup.ts	(date 1734387307472)
@@ -152,9 +152,9 @@
       cornerRadius: 5,
       xMargin: 12,
       yMargin: 8,
-      phetioReadOnly: true, // because sim state controls when this button is visible
       visiblePropertyOptions: {
-        phetioFeatured: false
+        phetioFeatured: false,
+        phetioReadOnly: true // because sim state controls when this button is visible
       },
       enabledPropertyOptions: {
         phetioFeatured: false

Please remember to regenerate the phet-io API when making this change.

[pixelzoom]

Thanks @samreid. Done in the above commits. I also tested migration, and there were no reported problems.

[pixelzoom]

Btw... This applied to both addAMateButton and startOverButton.