Fix MetadataFilter formatting in chat info side bar

[pmeier]

Reported in #499 (comment).

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The snippet below does not honor the indentation

ragna/ragna/deploy/_ui/central_view.py

Lines 208 to 210 in 9221bb8

	metadata_filters_readable = str(
	MetadataFilter.from_primitive(self.current_chat["metadata"]["input"])
	).replace("\n", "<br>")

form ragna.core import MetadataFilter

print(MetadataFilter.and_([MetadataFilter.in_("document_name", ["foo.md"])]))

AND(
  IN('document_name', ['foo.md']),
)

[pmeier]

We can just wrap into <pre>...</pre> to keep our formatting.