fix: unwrap symbolic constants in initsys generation

Author: AayushSabharwal

src/systems/nonlinear/initializesystem.jl

@@ -498,13 +498,13 @@ end
 
 function get_possibly_array_fallback_singletons(varmap, p)
     if haskey(varmap, p)
-        return varmap[p]
+        return value(varmap[p])
     end
     if symbolic_type(p) == ArraySymbolic()
         symbolic_has_known_size(p) || return nothing
         scal = collect(p)
         if all(x -> haskey(varmap, x), scal)
-            res = [varmap[x] for x in scal]
+            res = [value(varmap[x]) for x in scal]
             if any(x -> x === nothing, res)
                 return nothing
             elseif any(x -> x === missing, res)