Hide channel icon when changing server, preventing RoomToolbar from inheriting...

Hide channel icon when changing server, preventing RoomToolbar from inheriting last seen channel's icon.

app/src/main/java/chat/rocket/android/fragment/chatroom/AbstractChatRoomFragment.java

@@ -22,6 +22,7 @@ abstract class AbstractChatRoomFragment extends AbstractFragment {
   }
 
   protected void setToolbarTitle(CharSequence title) {
+    roomToolbar.hideChannelIcon();
     roomToolbar.setTitle(title);
   }
 

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/RoomToolbar.java

@@ -92,6 +92,10 @@ public class RoomToolbar extends Toolbar {
     toolbarText.setText(title);
   }
 
+  public void hideChannelIcon() {
+    roomTypeImage.setVisibility(GONE);
+  }
+
   public void showPrivateChannelIcon() {
     roomTypeImage.setImageDrawable(privateChannelDrawable);
     userStatusImage.setVisibility(GONE);