patch 8.0.0466: still macros that should be all-caps

Problem:    There are still a few macros that should be all-caps.
Solution:   Make a few more macros all-caps.
diff --git a/src/hardcopy.c b/src/hardcopy.c
index 449bfbd..4a0910d 100644
--- a/src/hardcopy.c
+++ b/src/hardcopy.c
@@ -569,7 +569,7 @@
 prt_message(char_u *s)
 {
     screen_fill((int)Rows - 1, (int)Rows, 0, (int)Columns, ' ', ' ', 0);
-    screen_puts(s, (int)Rows - 1, 0, hl_attr(HLF_R));
+    screen_puts(s, (int)Rows - 1, 0, HL_ATTR(HLF_R));
     out_flush();
 }