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/normal.c b/src/normal.c
index 6759e8e..53bda6c 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -3266,7 +3266,7 @@
 
     if (full_screen)
     {
-	if (!did_check && hl_attr(HLF_V) == 0)
+	if (!did_check && HL_ATTR(HLF_V) == 0)
 	    MSG(_("Warning: terminal cannot highlight"));
 	did_check = TRUE;
     }