[RICHED20] Fix array bounds overflow

editor.c(4518): warning C4045: 'text': array bounds overflow

dll/win32/riched20/editor.c

@@ -4500,7 +4500,11 @@ static BOOL ME_IsCandidateAnURL(ME_TextEditor *editor, const ME_Cursor *start, i
 #define MAX_PREFIX_LEN 9
 #define X(str)  str, ARRAY_SIZE(str) - 1
   struct prefix_s {
+#ifdef __REACTOS__
+    const WCHAR text[MAX_PREFIX_LEN + 1];
+#else
     const WCHAR text[MAX_PREFIX_LEN];
+#endif
     int length;
   }prefixes[] = {
     {X(L"prospero:")},