GUI: Fix modality of Application dialog when editing application.

gui/application.ui

@@ -2,6 +2,9 @@
 <ui version="4.0">
  <class>ApplicationDialog</class>
  <widget class="QDialog" name="ApplicationDialog">
+  <property name="windowModality">
+   <enum>Qt::WindowModal</enum>
+  </property>
   <property name="geometry">
    <rect>
     <x>0</x>

gui/settingsdialog.cpp

@@ -165,7 +165,7 @@ void SettingsDialog::ModifyApplication()
 
         ApplicationDialog dialog(mTempApplications->GetApplicationName(row),
                                  mTempApplications->GetApplicationPath(row),
-                                 tr("Modify an application"));
+                                 tr("Modify an application"), this);
 
         if (dialog.exec() == QDialog::Accepted)
         {