fix wrong package enable check variable

Author: yp05327

templates/user/overview/header.tmpl

@@ -25,7 +25,7 @@
 			<a href="{{.ContextUser.HomeLink}}/-/projects" class="{{if .PageIsViewProjects}}active {{end}}item">
 				{{svg "octicon-project"}} {{.locale.Tr "user.projects"}}
 			</a>
-			{{if (not .UnitPackagesGlobalDisabled)}}
+			{{if .IsPackageEnabled}}
 				<a href="{{.ContextUser.HomeLink}}/-/packages" class="{{if .IsPackagesPage}}active {{end}}item">
 					{{svg "octicon-package"}} {{.locale.Tr "packages.title"}}
 				</a>