[libc++][NFC] Move misplaced comment about implementation of ctype<wchar_t>

NOKEYCHECK=True
GitOrigin-RevId: f40bba48a593d4297a6d0b4d1534082858b1d0ac
diff --git a/src/locale.cpp b/src/locale.cpp
index 05801f1..7965096 100644
--- a/src/locale.cpp
+++ b/src/locale.cpp
@@ -747,8 +747,6 @@
     return out;
 }
 
-// template <> class ctype<wchar_t>;
-
 const ctype_base::mask ctype_base::space;
 const ctype_base::mask ctype_base::print;
 const ctype_base::mask ctype_base::cntrl;
@@ -762,6 +760,8 @@
 const ctype_base::mask ctype_base::alnum;
 const ctype_base::mask ctype_base::graph;
 
+// template <> class ctype<wchar_t>;
+
 locale::id ctype<wchar_t>::id;
 
 ctype<wchar_t>::~ctype()