Fix title when narrowed to self.

Included a case when narrowed to self, then
list size is 1, and set title as user name.

Author: jainkuniya

app/src/main/java/com/zulip/android/activities/ZulipActivity.java

@@ -1748,8 +1748,12 @@ protected void narrow(final Stream stream) {
         doNarrow(new NarrowFilterStream(stream, null));
     }
 
-        doNarrow(new NarrowFilterPM(Arrays.asList(app.getYou(), person)));
     private void narrowPMWith(final Person person) {
+        List<Person> list = new ArrayList<>();
+        list.add(person);
+        if (!person.getEmail().equals(app.getYou().getEmail()))
+            list.add(app.getYou());
+        doNarrow(new NarrowFilterPM(list));
         onNarrowFillSendBoxPrivate(new Person[]{person},false);
     }
 

app/src/main/java/com/zulip/android/filters/NarrowFilterPM.java

@@ -73,7 +73,9 @@ public boolean matches(Message msg) {
     public String getTitle() {
         ArrayList<String> names = new ArrayList<>();
         for (Person person : people) {
-            if (!person.equals(ZulipApp.get().getYou()) || people.size() == 1) { //If PM to self then show title as your name
+            // If PM to self then show title as your name
+            // people size == 1 implies PM to self
+            if (person.getId() != ZulipApp.get().getYou().getId() || people.size() == 1) {
                 names.add(person.getName());
             }
         }