Use pkill -f for $KEYBOARD

Some pkill implementations match on /proc/pid/stat which is limited to
15 characters [1]. $KEYBOARD defaults to svkbd-mobile-intl which is more
then 15 characters, so use -f to match the full string. Note that sxmo
uses busybox pkill by default which does not have this limit.

[1] https://manpages.debian.org/buster/procps/pgrep.1.en.html (Notes)

This patch was previously applied, and then reverted by a careless
refactor, restore it.

Signed-off-by: Anjandev Momi <anjan@momi.ca>
Signed-off-by: Aren Moynihan <aren@peacevolution.org>
Signed-off-by: Maarten van Gompel <proycon@anaproy.nl>

scripts/core/sxmo_keyboard.sh

@@ -23,7 +23,7 @@ open() {
 
 close() {
 	if [ -n "$KEYBOARD" ]; then # avoid killing everything !
-		pkill "$KEYBOARD"
+		pkill -f "$KEYBOARD"
 	fi
 }