ev-window: Simplify some logic in ev_window_open_uri

Merged Pablo Correa Gomez requested to merge pabloyoyoista/evince:window-small-cleanup into main

There is no need to re-check for "priv->metadata" when it just got assigned. And if "priv->metadata" does not exist, neither does "priv->bookmarks" that is cleared at the same time

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