changed usage statistic gathering defaults to off. See <https://bugs.gnu.org/25201>

--- a/src/mumble/Settings.cpp	2020-03-08 15:29:11.897056953 +0100
+++ b/src/mumble/Settings.cpp	2020-03-08 14:11:53.600486793 +0100
@@ -298,7 +298,7 @@
 	bHideInTray = !isUnityDesktop && QSystemTrayIcon::isSystemTrayAvailable();
 #endif
 	bStateInTray = true;
-	bUsage = true;
+	bUsage = false;
 	bShowUserCount = false;
 	bChatBarUseSelection = false;
 	bFilterHidesEmptyChannels = true;