Update manually-building-a-tile-server-18-04-lts.md #175
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Added "use a non-root account" again (from https://switch2osm.org/serving-tiles/manually-building-a-tile-server-20-04-lts/ ). Prompted by https://help.openstreetmap.org/questions/82750/2-issues-to-do-with-root-user-stopping-my-first-tile-server-from-working-renderd-atj-external-datapy .