patch 8.0.1495: having 'pumwidth' default to zero has no merit

Problem:    Having 'pumwidth' default to zero has no merit.
Solution:   Make the default 15, as the actual default value.
diff --git a/src/version.c b/src/version.c
index f5772a8..3a35475 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1495,
+/**/
     1494,
 /**/
     1493,