LatinIME: Actually increase emoji page density

Patch d627d97 decreased density by going from 14% to 16% key width.
Also, increasing density without also changing max_page_key_count
will just result in a truncated page, so adjust that, too.

Change-Id: I9ce763108223428a99479b91d872d6f76afacb5d
Signed-off-by: Mohammad Hasan Keramat J <ikeramat@protonmail.com>