small polishings (see description)

* General (makeshift): Set default first-tab to be profile, adjust search button appearance logic, add fragment labels
* DM inbox items: Adjust group chat avatar sizes, reinstate unread indicators
* DM thread: Swap buttons per spirit of #122
* Profile: Fix story fetcher logic
* Story: Fix bug where first story can't scroll to next user, unify subtitle to timestamp, swap buttons per #122
* Comment: Unfocus replying comment when X is pressed

app/src/main/res/navigation/discover_nav_graph.xml

@@ -26,6 +26,6 @@
     <fragment
         android:id="@+id/discoverFragment"
         android:name="awais.instagrabber.fragments.main.DiscoverFragment"
-        android:label="DiscoverFragment"
+        android:label="@string/title_discover"
         tools:layout="@layout/fragment_discover" />
 </navigation>

app/src/main/res/navigation/feed_nav_graph.xml

@@ -76,7 +76,7 @@
     <fragment
         android:id="@+id/feedFragment"
         android:name="awais.instagrabber.fragments.main.FeedFragment"
-        android:label="FeedFragment"
+        android:label="@string/feed"
         tools:layout="@layout/fragment_feed">
         <action
             android:id="@+id/action_feedFragment_to_storyViewerFragment"

app/src/main/res/navigation/more_nav_graph.xml

@@ -7,7 +7,7 @@
     <fragment
         android:id="@+id/morePreferencesFragment"
         android:name="awais.instagrabber.fragments.settings.MorePreferencesFragment"
-        android:label="More">
+        android:label="@string/more">
         <action
             android:id="@+id/action_morePreferencesFragment_to_settingsPreferencesFragment"
             app:destination="@id/settingsPreferencesFragment" />