patch 8.1.2287: using EndOfBuffer highlight in popup does not look good

Problem:    Using EndOfBuffer highlight in popup does not look good.
Solution:   Do not EndOfBuffer highlight. (closes #5204)
diff --git a/src/testdir/dumps/Test_popupwin_08.dump b/src/testdir/dumps/Test_popupwin_08.dump
index 114e642..814c979 100644
--- a/src/testdir/dumps/Test_popupwin_08.dump
+++ b/src/testdir/dumps/Test_popupwin_08.dump
@@ -1,10 +1,10 @@
 >x+0&#ffffff0@2| @71
-|~+0#4040ff13&| @73
+|~+0&#e0e0e08| @73
 |~| @73
 |~| @73
 |~| @73
 |~| @73
 |~| @73
 |~| @73
-| +0#0000000&@74
+| +0&#ffffff0@74
 @57|1|,|1| @10|A|l@1|