Wheelchair fixes (#18901)

* Remove netsync

* Replace OnStartup with OnMapInit

* Dont remove component

* Remove component ensure

* Remove using

* Cancel all moving or stand events

* Fix description

* Revert "Replace OnStartup with OnMapInit"

This reverts commit 5b7470d0dfa7a7c127dec6a06534b339f140ffac.

* Remove stand events cancel

Content.Server/Traits/Assorted/WheelchairBoundSystem.cs

@@ -16,6 +16,5 @@ public sealed class WheelchairBoundSystem : EntitySystem
     {
         var wheelchair = Spawn(component.WheelchairPrototype, Transform(uid).Coordinates);
         _buckleSystem.TryBuckle(uid, uid, wheelchair);
-        RemComp<WheelchairBoundComponent>(uid);
     }
 }