fix: remove incorrect fix to dummy derivatives in u0map added in #3337

Author: AayushSabharwal

src/systems/diffeqs/abstractodesystem.jl

@@ -1387,20 +1387,6 @@ function InitializationProblem{iip, specialize}(sys::AbstractSystem,
 
     u0map = merge(ModelingToolkit.guesses(sys), todict(guesses), todict(u0map))
 
-    # Replace dummy derivatives in u0map: D(x) -> x_t etc.
-    if has_schedule(sys)
-        schedule = get_schedule(sys)
-        if !isnothing(schedule)
-            for (var, val) in u0map
-                dvar = get(schedule.dummy_sub, var, var) # with dummy derivatives
-                if dvar !== var # then replace it
-                    delete!(u0map, var)
-                    push!(u0map, dvar => val)
-                end
-            end
-        end
-    end
-
     fullmap = merge(u0map, parammap)
     u0T = Union{}
     for sym in unknowns(isys)