chore: clean up includes

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

launcher/java/JavaChecker.cpp

@@ -36,12 +36,12 @@
 #include "JavaChecker.h"
 
 #include <QDebug>
-#include <QFile>
 #include <QMap>
 #include <QProcess>
 #include <utility>
 
 #include "Commandline.h"
+#include "FileSystem.h"
 #include "java/JavaUtils.h"
 
 JavaChecker::JavaChecker(QString path, QString args, int minMem, int maxMem, int permGen, int id)