Fix shabox regression

- Regression from go-gitea#22294

Author: Gusted

templates/repo/shabox_badge.tmpl

@@ -3,7 +3,7 @@
 		<div title="{{if eq .verification.TrustStatus "trusted"}}{{else if eq .verification.TrustStatus "untrusted"}}{{$.root.locale.Tr "repo.commits.signed_by_untrusted_user"}}: {{else}}{{$.root.locale.Tr "repo.commits.signed_by_untrusted_user_unmatched"}}: {{end}}{{.verification.Reason}}">
 		{{if ne .verification.SigningUser.ID 0}}
 			{{svg "gitea-lock"}}
-			{{avatar $.Context .verification.SigningUser 28 "signature"}}
+			{{avatar $.root.Context .verification.SigningUser 28 "signature"}}
 		{{else}}
 			<span title="{{$.root.locale.Tr "gpg.default_key"}}">{{svg "gitea-lock-cog"}}</span>
 			{{avatarByEmail $.Context .verification.SigningEmail "" 28 "signature"}}