slightly tweak canShowOwn and use it where appropriate (#806)

Author: DrumsnChocolate

app/abilities/user.js

@@ -14,7 +14,7 @@ export default class User extends Ability {
   }
 
   get canShowOwn() {
-    return this.session.isAuthenticated;
+    return this.session.isAuthenticated && this.session.currentUser?.id;
   }
 
   get canCreate() {

app/components/menu-sidebar.hbs

@@ -37,7 +37,7 @@
       <div class='profile-menu {{if layoutManager.profileMenuOpen "open"}}'>
         <MenuSidebarItem
           @link='users.user'
-          @hasPermission={{can 'show individual users'}}
+          @hasPermission={{can 'show own users'}}
           @icon='user'
           @title={{t 'mixin.menuItems.profile'}}
           @minor={{true}}

app/routes/profile.js

@@ -5,7 +5,7 @@ export default class ProfileRoute extends AuthenticatedRoute {
   @service router;
 
   canAccess() {
-    return this.abilities.can('show individual users');
+    return this.abilities.can('show own users');
   }
 
   redirect() {