Fix loading project settings

Incorrect conversion from the Variant to the String is fixed.

Change-Id: I082cdbeee1568d0b6b567232b50419d76572a197
Task-number: QTCREATORBUG-14404
Reviewed-by: hjk <hjk@theqtcompany.com>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/projectexplorer/runconfigurationaspects.cpp

@@ -217,7 +217,7 @@ void ArgumentsAspect::setArguments(const QString &arguments)
 
 void ArgumentsAspect::fromMap(const QVariantMap &map)
 {
-    m_arguments = map.value(m_key).toBool();
+    m_arguments = map.value(m_key).toString();
 }
 
 void ArgumentsAspect::toMap(QVariantMap &map) const