fix(update-lgsm): cd functionsdir but never back (#4140)

lgsm/functions/command_update_linuxgsm.sh

@@ -182,6 +182,7 @@ fi
 # Check and update modules.
 if [ -n "${functionsdir}" ]; then
 	if [ -d "${functionsdir}" ]; then
+		(
 			cd "${functionsdir}" || exit
 			for functionfile in *; do
 				# check if module exists in the repo and remove if missing.
@@ -225,6 +226,7 @@ if [ -n "${functionsdir}" ]; then
 					fi
 				fi
 			done
+		)
 	fi
 fi