Rollback of changelist 195496681. i18n informed us that it shouldn't be flipped.

*** Reason for rollback ***

i18n says the icon shouldn't be flipped. b/80123447

*** Original change description ***

Add help icon to the list of icons flipped when direction is RTL.

***

PiperOrigin-RevId: 197990228

Author: TedSander

lib/material_icon/material_icon.dart

@@ -15,7 +15,6 @@ const List<String> _flippedIcons = const [
   'arrow_forward',
   'chevron_left',
   'chevron_right',
-  'help_outline',
   'navigate_before',
   'navigate_next',
   'last_page',