uvol: move uxc persistent config volume to /var/run/uxc

As /var/state is used for UCI state, move persistent config for uxc
from /var/state/uxc to /var/run/uxc.
uxc itself has already been changed to look for it there.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

utils/uvol/files/common.sh

@@ -24,7 +24,7 @@ uvol_uci_add() {
 
 	case "$uciname" in
 		"_uxc")
-			target="/var/state/uxc"
+			target="/var/run/uxc"
 			;;
 		"_"*)
 			return 1