Controls search should ignore "Not set"

[willb.gaming]

When searching through the controls menu, you can use ctrl+f to search setting names and assigned keys. Almost every control has "Not set" in text as a placeholder for a hotkey, which means you can't search for controls using any of these letters. For example, if I want to search every hotkey that uses T, I have to manually check each setting because T is technically included in each. The search filter should just ignore this text.