[MODERATION] restore redirect on unblock

ctx.RedirectToFirst(ctx.FormString("redirect_to"), ctx.ContextUser.HomeLink())

was replaced by

 ctx.JSONOK()

in 128d77a3a Following up fixes for "Fix inconsistent user profile layout across tabs" (#25739)

thus changing the behavior (nicely spotted by the tests). This
restores it.

routers/web/user/profile.go

@@ -314,6 +314,5 @@ func Action(ctx *context.Context) {
 		})
 		return
 	}
-
-	ctx.JSONOK()
+	ctx.RedirectToFirst(ctx.FormString("redirect_to"), ctx.ContextUser.HomeLink())
 }