Change default 'Installed Games Only' to show those games in a new in…

…stall.

I think default was flipped by commit 01340c3, and it looks like it's just a bug.

But with the new library-sync feature, which we guide users towards, the Lutris service is now gone, so 'Installed Games Only' effectively hides what used to be the Lutris service. I see this confusing users on Discord at least.

This only affects new installations of Lutris; the saved setting is still respected.

lutris/gui/lutriswindow.py

@@ -305,7 +305,7 @@ def current_view_type(self):
 
     @property
     def filter_installed(self):
-        return settings.read_bool_setting("filter_installed", True)
+        return settings.read_bool_setting("filter_installed", False)
 
     @property
     def side_panel_visible(self):