Use current user's homedir as Phone memory path (#46)

Closes #15
This should return the current user's home directory instead of hard-coding it.
Documentation reference: https://doc.qt.io/qt-5/qstandardpaths.html
Alternatively, [`QDir::homePath](https://doc.qt.io/qt-5/qdir.html#homePath) can be used.
(not actually tested)

src/config.cpp

@@ -1,6 +1,7 @@
 #include "config.h"
 
 #include <QSettings>
+#include <QStandardPaths>
 
 QSettings sets("cepiperez", "fileboxplus");
 
@@ -29,5 +30,5 @@ void Config::removeConfig(QString data1)
 
 QString Config::getHome()
 {
-    return readConfig("PhoneMemoryFolder", "/home/defaultuser");
+    return QStandardPaths::standardLocations(QStandardPaths::HomeLocation).first();
 }