patch 8.2.4777: screendump tests fail because of a redraw

Problem:    Screendump tests fail because of a redraw.
Solution:   Do not output t_8u before receiving termresponse.  Redraw only
            when t_8u is not reset and termresponse is received.
diff --git a/src/version.c b/src/version.c
index fe7eb65..5849bb3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4777,
+/**/
     4776,
 /**/
     4775,