gluon-core: upgrade: fix directory movement

package/gluon-core/files/etc/uci-defaults/zzz-gluon-upgrade

@@ -35,6 +35,7 @@ do_component() {
 	local version="$(version_of "$component")"
 	if [ -z "$version" ]; then continue; fi
 
+	(
 		cd "$component"
 
 		local oldversion="$(oldversion_of "$component")"
@@ -56,6 +57,7 @@ do_component() {
 		do_dir invariant
 
 		echo "$version" > "$VERSION_DIR"/"$component"
+	)
 }
 
 
@@ -66,16 +68,14 @@ if [ -z "$oldversion" ]; then oldversion="$(cat "$VERSION_FILE_FREIFUNK" 2>/dev/
 if [ -z "$oldversion" ]; then oldversion="$(cat "$VERSION_FILE_LFF" 2>/dev/null)"; fi
 if [ -z "$oldversion" ]; then oldversion="$(cat "$VERSION_FILE_KFF" 2>/dev/null)"; fi
 
-(
 cd "$UPGRADE_DIR"
 
 do_component core
 
-	for component in *; do (
+for component in *; do
 	if [ "$component" != 'core' ]; then
 		do_component "$component"
 	fi
-	) done
-)
+done
 
 rm -f "$VERSION_FILE_FREIFUNK" "$VERSION_FILE_LFF" "$VERSION_FILE_KFF"