Disable submitting anonymous statistics by default

Index: src/mumble/Settings.cpp
--- src/mumble/Settings.cpp.orig
+++ src/mumble/Settings.cpp
@@ -389,7 +389,7 @@ Settings::Settings() {
 	bHideInTray = !isUnityDesktop && QSystemTrayIcon::isSystemTrayAvailable();
 #endif
 	bStateInTray              = true;
-	bUsage                    = true;
+	bUsage                    = false;
 	bShowUserCount            = false;
 	bShowVolumeAdjustments    = true;
 	bShowNicknamesOnly        = false;