t4200: give us a clean slate after "rerere gc" tests

The "multiple identical conflicts" test counts the number of entries
in the rerere database after trying a handful of mergy operations
and recording their resolutions, but without initializing the rerere
database to a known state, allowing the state left by previous tests
to trigger a false failure.  Make it robust by cleaning the database
before it starts.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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