locale.c: Mv line of code later in fcn

This avoids setting this until needed.

Author: khwilliamson

locale.c

@@ -1696,14 +1696,17 @@ S_new_numeric(pTHX_ const char *newnum)
      *                  such platforms.
      */
 
-    PL_numeric_underlying = TRUE;
 
     /* Save the new name if it isn't the same as the previous one, if any */
     if (strNE(PL_numeric_name, newnum)) {
         Safefree(PL_numeric_name);
         PL_numeric_name = savepv(newnum);
     }
 
+    /* We are in the underlying locale until changed at the end of this
+     * function */
+    PL_numeric_underlying = TRUE;
+
 #  ifdef USE_POSIX_2008_LOCALE
 
     /* We keep a special object for easy switching to */