Fix use-after-free when destroying filter chain

When using the `--gain` option the `temporaries_t` in
`changed_value_posts` filter stores a reference to the `<Revalued>` temp
account created in `display_filter_posts`. When destroying the filter
chain `display_filter_posts` is destroyed before `changed_value_posts`
and this can result in a use-after-free in `temporaries_t::clear()` when
`temps` in `changed_value_posts` is cleared during destruction if there
are any temp posts referencing the `<Revalued>` account.

Fix the issue by clearing the `temporaries_t` in `changed_value_posts`
before destroying the rest of the filter chain (which includes
`display_filter_posts`).

Fixes #541

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