Rename the voting rewards' "grey pet capsule" to "standard pet capsule" to avoid confusion

[yama#5900]

Unfortunately, myself and a few others thought it meant receiving a grey pet rather than a normal grey capsule, which is a little bothersome considering it's an accumulated voting reward that takes a spot of time. We probably aren't the only ones who've experienced this situation.

this blue parakeet will be recycled

Edited December 23, 2021 by yama#5900
typo