fix(rn) enable reactions by default

react/features/base/flags/constants.js

  */
 export const RAISE_HAND_ENABLED = 'raise-hand.enabled';
 
+/**
+ * Flag indicating if the reactions feature should be enabled.
+ * Default: enabled (true).
+ */
+export const REACTIONS_ENABLED = 'reactions.enabled';
+
 /**
  * Flag indicating if recording should be enabled.
  * Default: auto-detected.
  * Default: disabled (false).
  */
 export const WELCOME_PAGE_ENABLED = 'welcomepage.enabled';
-
-/**
- * Flag indicating if the reactions feature should be enabled.
- * Default: disabled (false).
- */
-export const REACTIONS_ENABLED = 'reactions.enabled';

react/features/toolbox/components/native/OverflowMenu.js

         _bottomSheetStyles: ColorSchemeRegistry.get(state, 'BottomSheet'),
         _isOpen: isDialogOpen(state, OverflowMenu_),
         _width: state['features/base/responsive-ui'].clientWidth,
-        _reactionsEnabled: getFeatureFlag(state, REACTIONS_ENABLED, false)
+        _reactionsEnabled: getFeatureFlag(state, REACTIONS_ENABLED, true)
     };
 }