patch 8.2.0887: searchcount().exact_match is 1 right after a match

Problem:    Searchcount().exact_match is 1 right after a match.
Solution:   Use LT_POS() instead of LTOREQ_POS(). (closes #6189)
diff --git a/src/search.c b/src/search.c
index 0c253e9..2108062 100644
--- a/src/search.c
+++ b/src/search.c
@@ -3252,7 +3252,7 @@
 	    if (LTOREQ_POS(lastpos, p))
 	    {
 		cur = cnt;
-		if (LTOREQ_POS(p, endpos))
+		if (LT_POS(p, endpos))
 		    exact_match = TRUE;
 	    }
 	    fast_breakcheck();