put audit --fix includes in the fragment, not the purview

The inserter aimed at the spot before the first import, which in a module
unit is past the module declaration - so the includes landed in the
purview, attaching those declarations to the module, and re-running piled
up duplicates. It now targets the global module fragment for module units
and keeps the before-first-import rule only for ordinary units.

Console/PoKeys55.cpp

@@ -1,4 +1,16 @@
 module;
+#include <array>
+#include <chrono>
+#include <cstddef>
+#include <deque>
+#include <limits>
+#include <mutex>
+#include <ostream>
+#include <sstream>
+#include <type_traits>
+#include <unordered_map>
+#include <utility>
+#include <vector>
 #include "winheaders.h"   // HANDLE; setupapi.h happens to pull it in, but say so
 #include <cstdlib>
 #include <string>