Remove Tigrinya (ti) from Settings languages

Tigrinya does not have any localized country names for ER (Eritrea)
and ET (Ethiopia), which the user would need to choose if they choose
Tigrinya. Removing from user selectable languages until CLDR/ICU
adds more data.

Change-Id: Iaa7f702db0bb8749a4bdc2e88b03e5ea8590bad9
Fixes: 63807177
Test: Manual (Tigrinya is no longer shown in Settings)