Issue description: The filter can dupe any item that's in its list

What happens: when you click the "extract" button any item in the filter list will dupe into useable items

What you expected to happen: not this dupe bug :)

Steps to reproduce: Just add any items into the filter then click the extract button

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Version (make sure you are on the latest version before reporting):

• Minecraft: 1.15.2
• Forge: 31.2.0
• Refined Storage: 1.8.4

Does this issue occur on a server? [yes/no] Yes

If a (crash)log is relevant for this issue, link it here:

[pastebin/gist/etc link here]