CrateHeader: Add @versionNum argument

Author: Turbo87

app/components/crate-header.hbs

@@ -22,8 +22,8 @@
 <NavTabs aria-label="{{@crate.name}} crate subpages" local-class="nav" as |nav|>
   <nav.Tab
     @link={{if
-      (eq this.router.currentRouteName "crate.version")
-      (link "crate.version" @crate @version.num)
+      @versionNum
+      (link "crate.version" @crate @versionNum)
       (link "crate.index" @crate)
     }}
     data-test-readme-tab

app/components/crate-header.js

@@ -3,7 +3,6 @@ import { inject as service } from '@ember/service';
 import Component from '@glimmer/component';
 
 export default class CrateHeader extends Component {
-  @service router;
   @service session;
 
   @computed('args.crate.owner_user', 'session.currentUser.id')

app/templates/crate/version.hbs

@@ -1,6 +1,10 @@
 {{page-title this.crate.name}}
 
-<CrateHeader @crate={{this.crate}} @version={{this.currentVersion}} />
+<CrateHeader
+  @crate={{this.crate}}
+  @version={{this.currentVersion}}
+  @versionNum={{this.requestedVersion}}
+/>
 
 <div local-class='crate-info'>
   <div local-class="docs">