fix issue with loading stdlibs stalecheck inconsistency

This was an accidental late change in the PR, and I forgot why this
needed to be exactly written this way (and why this wasn't equivalent).

Followup to #54739 fixing #53983

base/loading.jl

@@ -1935,9 +1935,10 @@ end
                 dep = staledeps[i]
                 dep isa Module && continue
                 modpath, modkey, modbuild_id, modcachepath, modstaledeps, modocachepath = dep::Tuple{String, PkgId, UInt128, String, Vector{Any}, Union{Nothing, String}}
-                dep = get(loaded_precompiles, modkey => modbuild_id, nothing)
-                if dep === nothing
+                if stalecheck
                     dep = maybe_root_module(modkey)
+                else
+                    dep = get(loaded_precompiles, modkey => modbuild_id, nothing)
                 end
                 while true
                     if dep isa Module