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_06.dump b/src/testdir/dumps/Test_popupwin_06.dump
index 59a9d0e..6d89503 100644
--- a/src/testdir/dumps/Test_popupwin_06.dump
+++ b/src/testdir/dumps/Test_popupwin_06.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| @15| +0#4040ff13#ffffff0@41
-|~| @6|a+0#0000001#ffd7ff255| |c+0#ff404010&|o|m@1|e|n|t| +0#0000001&|l|i|n|e| @10| +0#4040ff13#ffffff0@41
-|~| @6|t+0#0000001#ffd7ff255|h|i|s| |l|i|n|e| |w|i|l@1| |n|o|t| |f|i|t| |h|e| +0#4040ff13#ffffff0@41
-|~| @6|r+0#0000001#ffd7ff255|e| @22| +0#4040ff13#ffffff0@41
+|~| @6|o+0#0000001#ffd7ff255|t|h|e|r| |t|a|b| @15| +0#0000000#e0e0e08@41
+|~| @6|a+0#0000001#ffd7ff255| |c+0#ff404010&|o|m@1|e|n|t| +0#0000001&|l|i|n|e| @10| +0#0000000#e0e0e08@41
+|~| @6|t+0#0000001#ffd7ff255|h|i|s| |l|i|n|e| |w|i|l@1| |n|o|t| |f|i|t| |h|e| +0#0000000#e0e0e08@41
+|~| @6|r+0#0000001#ffd7ff255|e| @22| +0#0000000#e0e0e08@41
 |~| @73
 |~| @73
-|:+0#0000000&|r|e|d|r|a|w| @49|0|,|0|-|1| @8|A|l@1| 
+|:+0&#ffffff0|r|e|d|r|a|w| @49|0|,|0|-|1| @8|A|l@1|