Revert "added possibility to start in Document Mode"

This reverts commit 62a5ad33bd.

resources/forms/preferences.ui

@@ -387,11 +387,6 @@
                 <string>Desktop</string>
                </property>
               </item>
-              <item>
-               <property name="text">
-                <string>Document</string>
-               </property>
-              </item>
              </widget>
             </item>
             <item row="0" column="2">

src/core/UBApplication.cpp

@@ -351,12 +351,10 @@ int UBApplication::exec(const QString& pFileToImport)
     if (pFileToImport.length() > 0)
         UBApplication::applicationController->importFile(pFileToImport);
 
-    if (UBSettings::settings()->appStartMode->get().toInt() == 0)
-        applicationController->showBoard();
-    else if (UBSettings::settings()->appStartMode->get().toInt() == 1)
+    if (UBSettings::settings()->appStartMode->get().toInt())
         applicationController->showDesktop();
-    else if (UBSettings::settings()->appStartMode->get().toInt() == 2)
-        applicationController->showDocument();
+    else
+        applicationController->showBoard();
 
     emit UBDrawingController::drawingController()->colorPaletteChanged();