matchbox-session-sato: synchronize with matchbox 'session' file in poky

This file has not been synchronized with the one in Poky since previous
versions of DEY. Not much has changed, but sync it anyway.

Also:

* Get SHOWCURSOR from formfactor config files, but fallback to one
  value depending on HAVE_TOUCHSCREEN if it was not configured.

* Rename the bbappend to the version generic '_%.bbappend'

https://jira.digi.com/browse/DEL-3046

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-sato/matchbox-sato/matchbox-session-sato/session

@@ -2,12 +2,14 @@
 
 . /etc/formfactor/config
 
-## Use SHOWCURSOR from formfactor config files instaed of hardcoding it
-# if [ "$HAVE_TOUCHSCREEN" = "1" ]; then
-#     SHOWCURSOR="no"
-# else
-#     SHOWCURSOR="yes"
-# fi
+## Use first SHOWCURSOR from formfactor config files (fallback to set it depending on HAVE_TOUCHSCREEN)
+if [ -z "${SHOWCURSOR}" ]; then
+    if [ "$HAVE_TOUCHSCREEN" = "1" ]; then
+        SHOWCURSOR="no"
+    else
+        SHOWCURSOR="yes"
+    fi
+fi
 
 if [ "$HAVE_KEYBOARD" = "1" ]; then
     KEYBOARD_APPLET=""
@@ -15,6 +17,10 @@ else
     KEYBOARD_APPLET="keyboard"
 fi
 
+# Tell GTK+3 we really want server side decorations, even with
+# GtkHeaderBar using applications: Without that mb-panel will render
+# on top of the client side decorations.
+export GTK_CSD=0
 
 matchbox-desktop &