Update HF Deku Scrub Location Hint Text

[Natheirean]

Changed hint text from single upgrade deku scrub to lonely deku scrub. In vanilla, this scrub sells a piece of heart, not an item upgrade

[cjohnson57]

Makes sense to me

[fenhl]

I believe “Upgrade” was used here in the sense of “nonrepeatable item check” aka “relevant without scrub shuffle”. The wording proposed in this PR is less ambiguous though as discussed in #dev-suggestions.