Delete MatchEndPopupMain.java

Fix merge of #288 (probably because the file appeared in 2 pull commits).

Rest of #288 merge seems OK.

The file is already [here}(https://github.com/HearthStats/HearthStats.net-Uploader/tree/master/src/test/java/net/hearthstats/ui)
Merge pull request #292 from tyrcho/patch-2

Delete MatchEndPopupMain.java