patch 8.1.1374: check for file changed triggers too often

Problem:    Check for file changed triggers too often.
Solution:   Don't use "b_p_ar" when it is negative.

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1374,
 /**/
     1373,
 /**/