Enable execute status of invite icon

src/freedombone-image-customise

             echo 'Icon=/usr/share/freedombone/avatars/invite.png' >> /home/$MY_USERNAME/Desktop/invite.desktop
             echo 'Terminal=false' >> /home/$MY_USERNAME/Desktop/invite.desktop
             echo 'Categories=Application;' >> /home/$MY_USERNAME/Desktop/invite.desktop
+            chmod +x /home/$MY_USERNAME/Desktop/invite.desktop
         fi
     else
         if [ -f /home/$MY_USERNAME/Desktop/invite.desktop ]; then