LatinIME: Fix to English dictionary can be added after deleting

English dictionary item is deleted from Database when enter AOSP
settings at the second time.

Add a judgement to avoid English dictionary item to be deleted.

Change-Id: I5a69d583db5585ae4dcc9a888bb66c9bf98fe82f
CRs-Fixed: 857148
Signed-off-by: Mohammad Hasan Keramat J <ikeramat@protonmail.com>