patch 8.1.2050: popup window test fails in some configurations

Problem:    Popup window test fails in some configurations. (James McCoy)
Solution:   Clear the command line.
diff --git a/src/version.c b/src/version.c
index 1f120d3..a2c5ddd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2050,
+/**/
     2049,
 /**/
     2048,