refactor: remove unused includes and don't set Tox as organization

Having "Tox" as Organization results in all standard paths being "Tox/
qTox" instead of "qTox". Since there is no such thing as "Tox"
organization I removed it.

src/main.cpp

@@ -173,7 +173,6 @@ int main(int argc, char* argv[])
 #if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
     a->setDesktopFileName("io.github.qtox.qTox");
 #endif
-    a->setOrganizationName("Tox");
     a->setApplicationVersion("\nGit commit: " + QString(GIT_VERSION));
 
     // Install Unicode 6.1 supporting font

src/widget/form/settings/userinterfaceform.cpp

@@ -26,7 +26,6 @@
 #include <QFont>
 #include <QMessageBox>
 #include <QRegularExpressionValidator>
-#include <QStandardPaths>
 #include <QStyleFactory>
 #include <QTime>
 #include <QVector>

updater/main.cpp

@@ -26,7 +26,6 @@
 #include <QDir>
 #include <QFile>
 #include <QMutex>
-#include <QStandardPaths>
 #include <memory>
 #include <windows.h>
 

updater/widget.cpp

@@ -28,7 +28,6 @@
 #include <QMetaObject>
 #include <QProcess>
 #include <QSettings>
-#include <QStandardPaths>
 
 #include "update.h"