Fix reaction of issues (#21185)
Fix #20860.
`CommentID` in `FindReactionsOptions` should be -1 to search reactions
with zero comment id.
https://github.com/go-gitea/gitea/blob/8351172b6e5221290dc5b2c81e159e2eec0b43c8/models/issues/reaction.go#L108-L121
Co-authored-by: Lauris BH <lauris@nix.lv>
authored by