patch 8.0.0448: some macros are in lower case

Problem:    Some macros are in lower case, which can be confusing.
Solution:   Make a few lower case macros upper case.
diff --git a/src/workshop.c b/src/workshop.c
index 0b9774f..844da85 100644
--- a/src/workshop.c
+++ b/src/workshop.c
@@ -1087,7 +1087,7 @@
     *curCol = curwin->w_cursor.col;
 
     if (curbuf->b_visual.vi_mode == 'v' &&
-	    equalpos(curwin->w_cursor, curbuf->b_visual.vi_end))
+	    EQUAL_POS(curwin->w_cursor, curbuf->b_visual.vi_end))
     {
 	*selStartLine = curbuf->b_visual.vi_start.lnum;
 	*selStartCol = curbuf->b_visual.vi_start.col;