patch 8.2.3270: prop_find() finds property with ID -2

Problem:    prop_find() finds property with ID -2.
Solution:   Use a separate flag to indicate an ID was specified. (issue #8674)

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3270,
 /**/
     3269,
 /**/