Remove hard-coded disabling of debug logs

Instead, set the default level of all logs to QtWarningMsg.

The call to setFilterRules overrides the user preferences in qtlogging.ini.

Change-Id: Id5f6cd550d14ff7f45ae04c5d3110e0bafb0f072
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/android/androidtoolmanager.cpp

@@ -35,7 +35,7 @@
 #include <QLoggingCategory>
 
 namespace {
-Q_LOGGING_CATEGORY(androidToolLog, "qtc.android.sdkManager")
+Q_LOGGING_CATEGORY(androidToolLog, "qtc.android.sdkManager", QtWarningMsg)
 }
 
 namespace Android {