increase maximum description lenght in UI

In the UI input, the number of glyphs is currently limited to
480 (with 8k max bytes). For larger groups with guidelines, more space
is needed.
This patch increases the number of glyphs and bytes by
a factor of eight to 3840 and 65536.
Signal community feature request: https://community.signalusers.org/t/expand-the-group-chat-description-or-pin-posts/65179

Author: isopod-a

app/src/main/java/org/thoughtcrime/securesms/profiles/edit/CreateProfileFragment.java

@@ -60,8 +60,8 @@
 public class CreateProfileFragment extends LoggingFragment {
 
   private static final String TAG                    = Log.tag(CreateProfileFragment.class);
-  private static final int    MAX_DESCRIPTION_GLYPHS = 480;
-  private static final int    MAX_DESCRIPTION_BYTES  = 8192;
+  private static final int    MAX_DESCRIPTION_GLYPHS = 3840;
+  private static final int    MAX_DESCRIPTION_BYTES  = 65536;
 
   private Intent nextIntent;