search: Flatten line breaks in summaries

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AppStream summaries are allowed to contain embedded newlines and tabs,
which break the fixed-width table layout used by `flatpak search`.

Replace embedded newlines and tabs with spaces before adding the summary
as a table column.

Fixes: https://github.com/flatpak/flatpak/issues/6132

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f