Scheduler ResolveTimeConflicts Demo — Remove CSS animation offset workaround

[aleksei-semikozov]

The demo uses a hardcoded top: 44px on hidden form groups to compensate for the slide animation offset when a custom item (conflict-informer) is placed above mainGroup. This was a workaround for the bug fixed in #32955. After the fix, --dx-scheduler-animation-top is calculated automatically, so the top: 44px rule and padding-top: 0 overrides can be removed from the demo's CSS.

[aleksei-semikozov]

Rename helpers function from Vlada