with -i for postgresql user environment

unless could not change directory to "/root": Permission denied

Author: JOduMonT

install/hst-install-debian.sh

@@ -1421,7 +1421,7 @@ if [ "$postgresql" = 'yes' ]; then
     ppass=$(gen_pass)
     cp -f $HESTIA_INSTALL_DIR/postgresql/pg_hba.conf /etc/postgresql/*/main/
     systemctl restart postgresql
-    sudo -u postgres psql -c "ALTER USER postgres WITH PASSWORD '$ppass'"
+    sudo -iu postgres psql -c "ALTER USER postgres WITH PASSWORD '$ppass'"
 
     # Configuring phpPgAdmin
     if [ "$apache" = 'yes' ]; then