Fix improper HTMLURL usages in Go code (#22839)

In Go code, HTMLURL should be only used for external systems, like
API/webhook/mail/notification, etc.

If a URL is used by `Redirect` or rendered in a template, it should be a
relative URL (aka `Link()` in Gitea)

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/web/user/package.go

@@ -376,7 +376,7 @@ func PackageSettingsPost(ctx *context.Context) {
 			ctx.Flash.Success(ctx.Tr("packages.settings.delete.success"))
 		}
 
-		ctx.Redirect(ctx.Package.Owner.HTMLURL() + "/-/packages")
+		ctx.Redirect(ctx.Package.Owner.HomeLink() + "/-/packages")
 		return
 	}
 }