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_02.dump b/src/testdir/dumps/Test_popupwin_02.dump
index 0de7f49..9f658e5 100644
--- a/src/testdir/dumps/Test_popupwin_02.dump
+++ b/src/testdir/dumps/Test_popupwin_02.dump
@@ -1,10 +1,10 @@
 | +8#0000001#e0e0e08|+| |[|N|o| |N|a|m|e|]| | +2#0000000#ffffff0|[|N|o| |N|a|m|e|]| | +1&&@49|X+8#0000001#e0e0e08
 > +0#0000000#ffffff0@74
-|~+0#4040ff13&| @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
+|~+0&#e0e0e08| @73
+|~| @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&@56|0|,|0|-|1| @8|A|l@1| 
+| +0&#ffffff0@56|0|,|0|-|1| @8|A|l@1|