[displaymanager] adopt to Cinnamon 2.6.8

src/modules/displaymanager/main.py

@@ -33,7 +33,7 @@ desktop_environments = [
     DesktopEnvironment('/usr/bin/startkde', 'kde-plasma'),  # KDE Plasma 4
     DesktopEnvironment('/usr/bin/gnome-session', 'gnome'),
     DesktopEnvironment('/usr/bin/startxfce4', 'xfce'),
-    DesktopEnvironment('/usr/bin/cinnamon-session', 'cinnamon-session'),
+    DesktopEnvironment('/usr/bin/cinnamon-session-cinnamon', 'cinnamon'),
     DesktopEnvironment('/usr/bin/mate-session', 'mate'),
     DesktopEnvironment('/usr/bin/enlightenment_start', 'enlightenment'),
     DesktopEnvironment('/usr/bin/lxsession', 'LXDE'),