Add `/opt/flash` as source for Pepper Flash plugin
Add `/opt/flash` as source for Pepper Flash plugin

`/opt/flash/current` will be a symlink to the most-recently downloaded
version of the PPAPI Flash plugin.

Also fixes issue where `(N[1])` wasn't doing what I thought it was (the
`[1]` was being applied per-array-entry, not overall).

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