🐛 fix jumping "Invite User" button when modal is opened

closes TryGhost/Ghost#7890
- moved the modal outside of the `<header>` tag to avoid triggering unexpected flexbox justification

ghost/admin/app/templates/team/index.hbs

@@ -6,15 +6,15 @@
             <section class="view-actions">
                 <button class="btn btn-green" {{action "toggleInviteUserModal"}} >Invite People</button>
             </section>
-
-            {{#if showInviteUserModal}}
-                {{gh-fullscreen-modal "invite-new-user"
-                                      close=(action "toggleInviteUserModal")
-                                      modifier="action"}}
-            {{/if}}
         {{/unless}}
     </header>
 
+    {{#if showInviteUserModal}}
+        {{gh-fullscreen-modal "invite-new-user"
+                              close=(action "toggleInviteUserModal")
+                              modifier="action"}}
+    {{/if}}
+
     {{#gh-infinite-scroll
         fetch="loadNextPage"
         isLoading=isLoading