Use subshells correctly

scripts/installer.sh

@@ -99,7 +99,7 @@ if [[ "$(cloudron-syslog --version)" != "1.0.0" ]]; then
     rm -rf ${CLOUDRON_SYSLOG_DIR}
     mkdir -p ${CLOUDRON_SYSLOG_DIR}
     $curl -sL https://git.cloudron.io/cloudron/cloudron-syslog/-/archive/master/cloudron-syslog-master.tar.gz | tar zxvf - --strip-components=1 -C ${CLOUDRON_SYSLOG_DIR}
-    $(cd ${CLOUDRON_SYSLOG_DIR} && npm install --unsafe-perm) # need --unsafe-perm since we run as root and npm drops privileges
+    (cd ${CLOUDRON_SYSLOG_DIR} && npm install --unsafe-perm) # need --unsafe-perm since we run as root and npm drops privileges
 fi
 
 if ! id "${USER}" 2>/dev/null; then