Remove enableprejump config option and associated code as this is now

fully functional and cannot be disabled because that would break timings.

bin/OpenSimDefaults.ini

@@ -298,10 +298,6 @@
     ; won't look right until the physics engine supports it
     ; (i.e delays takeoff for a moment)
 
-    ; This is commented so it will come on automatically once it's
-    ; supported.
-    ; enableprejump = true
-
     ; Simulator Stats URI
     ; Enable JSON simulator data by setting a URI name (case sensitive)
     ; Stats_URI = "jsonSimStats"