Fix TorrentFileGuard::setAutoRemove() recursion problem. Closes #6488.

The problem was created during Qt 4 drop, when FileGuard was promoted
from a member to a base class. The function was blindly changed.

src/base/torrentfileguard.cpp

@@ -77,11 +77,6 @@ void TorrentFileGuard::markAsAddedToSession()
     m_wasAdded = true;
 }
 
-void TorrentFileGuard::setAutoRemove(bool remove)
-{
-    setAutoRemove(remove);
-}
-
 TorrentFileGuard::AutoDeleteMode TorrentFileGuard::autoDeleteMode()
 {
     QMetaEnum meta {modeMetaEnum()};