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_04.dump b/src/testdir/dumps/Test_popupwin_04.dump
index c8b0438..d83beda 100644
--- a/src/testdir/dumps/Test_popupwin_04.dump
+++ b/src/testdir/dumps/Test_popupwin_04.dump
@@ -1,10 +1,10 @@
 > +0&#ffffff0@74
-|~+0#4040ff13&| @73
+|~+0&#e0e0e08| @73
 |~| @73
-|~| @6|o+0#0000001#ffd7ff255|t|h|e|r| |t|a|b| @10| +0#4040ff13#ffffff0@46
-|~| @6|a+0#0000001#ffd7ff255| |c+0#ff404010&|o|m@1|e|n|t| +0#0000001&|l|i|n|e| @5| +0#4040ff13#ffffff0@46
+|~| @6|o+0#0000001#ffd7ff255|t|h|e|r| |t|a|b| @10| +0#0000000#e0e0e08@46
+|~| @6|a+0#0000001#ffd7ff255| |c+0#ff404010&|o|m@1|e|n|t| +0#0000001&|l|i|n|e| @5| +0#0000000#e0e0e08@46
 |~| @73
 |~| @73
 |~| @73
 |~| @73
-|:+0#0000000&|q|u|i|t|!| @50|0|,|0|-|1| @8|A|l@1| 
+|:+0&#ffffff0|q|u|i|t|!| @50|0|,|0|-|1| @8|A|l@1|