patch 8.2.0305: relativenumber test fails on some systems

Problem:    Relativenumber test fails on some systems. (James McCoy)
Solution:   Clear the command line.
diff --git a/src/version.c b/src/version.c
index ce3702d..2c4f78b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    305,
+/**/
     304,
 /**/
     303,