tests: shell: Pretty-print all *.json-nft dumps

The problem with single line output as produced by 'nft -j list ruleset'
is its incompatibility to unified diff format as any change in this
single line will produce a diff which contains the old and new lines in
total. This is not just unreadable but will blow up patches which may
exceed mailinglists' mail size limits.

Convert them all at once by feeding their contents to
tests/shell/helpers/json-pretty.sh.

Signed-off-by: Phil Sutter <phil@nwl.cc>

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