Move "authenticate" string from image_info to Options splay-tree

diff --git a/coders/xps.c b/coders/xps.c
index 274b278..0d6d480 100644
--- a/coders/xps.c
+++ b/coders/xps.c
@@ -110,6 +110,9 @@
     options[MaxTextExtent],
     input_filename[MaxTextExtent];
 
+  const char
+    option;
+
   const DelegateInfo
     *delegate_info;
 
@@ -300,9 +303,10 @@
       if (read_info->scenes != (char *) NULL)
         *read_info->scenes='\0';
     }
-  if (read_info->authenticate != (char *) NULL)
+  option=GetImageOption(read_info,"authenticate");
+  if (option != (const char *) NULL)
     (void) FormatLocaleString(options+strlen(options),MaxTextExtent,
-      " -sXPSPassword=%s",read_info->authenticate);
+      " -sPCLPassword=%s",option);
   (void) CopyMagickString(filename,read_info->filename,MaxTextExtent);
   (void) AcquireUniqueFilename(read_info->filename);
   (void) FormatLocaleString(command,MaxTextExtent,