Fixed a bug in the unlink dialog, changed the link/unlink keyboard shortcuts

src/Editor/WorldEditor/CConfirmUnlinkDialog.h

@@ -34,6 +34,7 @@ private:
 public:
     explicit CConfirmUnlinkDialog(QWidget *pParent = 0)
         : QDialog(pParent)
+        , mChoice(eCancel)
     {
         mpLabel = new QLabel("Which links should be removed from the selected instances?");
         mpAllButton = new QPushButton("All");

src/Editor/WorldEditor/CWorldEditor.ui

@@ -515,7 +515,7 @@
     <string>Link</string>
    </property>
    <property name="shortcut">
-    <string>Alt+C</string>
+    <string>L</string>
    </property>
   </action>
   <action name="ActionUnlink">
@@ -530,7 +530,7 @@
     <string>Unlink</string>
    </property>
    <property name="shortcut">
-    <string>Alt+D</string>
+    <string>U</string>
    </property>
   </action>
   <action name="ActionDrawWorld">