Update image-jpeg-xl.h

Author: TitikshaBansal

cupsfilters/image-jpeg-xl.h

@@ -5,7 +5,7 @@
 #include <stdio.h>
 #include "image-private.h"  
 
-int is_jpegxl(const unsigned char *header, size_t len);
+int _cfIsJPEGXL(const unsigned char *header, size_t len);
 
 int _cfImageReadJPEGXL(cf_image_t *img, FILE *fp,
                        cf_icspace_t primary, cf_icspace_t secondary,