deleting request cache now deletes old cache file

We previously had a requests cache file just named `viper-requests.json`
in the system's cache folder, we now also delete that alongside the
current file, simply cleaning up a user's cache folder, as that file
will not be used anymore.

We also technically had a file named `requests.json`, however the name
is too vague and could potentially (unlikely, but oh well) delete
something that isn't actually Viper's older requests cache file.

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