move sxmo data to XDG_DATA_HOME

Breaking change. Make sure you send an email to the mailing list
telling users to move their
$XDG_CONFIG_HOME/{modem,notifications} files/folders to
$XDG_DATA_HOME

Signed-off-by: Anjandev Momi <anjan@momi.ca>

scripts/modem/sxmo_modemcall.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-LOGDIR="$XDG_CONFIG_HOME"/sxmo/modem
+LOGDIR="$XDG_DATA_HOME"/sxmo/modem
 trap "gracefulexit" INT TERM
 
 modem_n() {
@@ -199,4 +199,4 @@ pickup() {
 }
 
 modem_n || fatalerr "Couldn't determine modem number - is modem online?"
-"$@"
+"$@"