patch 8.2.1920: listlbr test fails when run after another test

Problem:    Listlbr test fails when run after another test.
Solution:   Add test separately to list of test targets.
diff --git a/src/version.c b/src/version.c
index 2aa5b0d..7031dc5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1920,
+/**/
     1919,
 /**/
     1918,