AddCloudWizard Folder read-only

.. bit of a catch 22 scenario with folder being selected
   without opening the service by manually editing the
   folder name.

.. this causes problems when open is then called and the
   folder is invalid - especially when we're in the middle
   of configuring the service anyway.

.. to avoid this, the folder widget is now read-only and
   you must select the folder using the browse function.

src/Cloud/AddCloudWizard.cpp

@@ -443,6 +443,7 @@ AddSettings::AddSettings(AddCloudWizard *parent) : QWizardPage(parent), wizard(p
     folderLabel = new QLabel(tr("Folder"));
     folder = new QLineEdit(this);
     folder->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
+    folder->setReadOnly(true); // only allow folder selection via di
     browse = new QPushButton(tr("Browse"));
     syncStartup = new QCheckBox(tr("Sync on startup"));
     syncImport = new QCheckBox(tr("Sync on import"));