FIX: close user card after clicking Message button

This was primarily an issue on mobile, where after clicking the "Messsage" button in the user card, the composer would load behind the user card overlay.

app/assets/javascripts/discourse/components/user-card-contents.js.es6

@@ -184,6 +184,14 @@ export default Ember.Component.extend(
         this._close();
       },
 
+      composePM(user, post) {
+        this._close();
+
+        Ember.getOwner(this)
+          .lookup("router:main")
+          .send("composePrivateMessage", user, post);
+      },
+
       cancelFilter() {
         const postStream = this.postStream;
         postStream.cancelFilter();

app/assets/javascripts/discourse/templates/components/user-card-contents.hbs

@@ -72,7 +72,7 @@
             <li class='compose-pm'>
               {{d-button
               class="btn-primary"
-              action=(route-action "composePrivateMessage" user post)
+              action=(action "composePM" user post)
               icon="envelope"
               label="user.private_message"}}
             </li>

test/javascripts/acceptance/user-card-test.js.es6

@@ -1,7 +1,7 @@
 import { acceptance } from "helpers/qunit-helpers";
 import DiscourseURL from "discourse/lib/url";
 
-acceptance("User Card");
+acceptance("User Card", { loggedIn: true });
 
 QUnit.test("user card", async assert => {
   await visit("/t/internationalization-localization/280");
@@ -16,4 +16,13 @@ QUnit.test("user card", async assert => {
     DiscourseURL.routeTo.calledWith("/u/eviltrout"),
     "it should navigate to the user profile"
   );
+
+  await click("a[data-user-card=charlie]:first");
+  assert.ok(visible("#user-card"), "card should appear");
+
+  await click(".card-content .compose-pm button");
+  assert.ok(
+    invisible("#user-card"),
+    "user card dismissed after hitting Message button"
+  );
 });

test/javascripts/fixtures/topic.js.es6

@@ -2057,6 +2057,13 @@ export default {
           avatar_template: "/images/avatar.png",
           post_count: 4
         },
+        {
+          id: 5,
+          username: "charlie",
+          uploaded_avatar_id: 5275,
+          avatar_template: "/images/avatar.png",
+          post_count: 1
+        },
         {
           id: 3704,
           username: "mojzis",