Fix to show eUICC preference in eng build

DEVELOPMENT_SETTINGS_ENABLED is not set before entering Developer
options in settings app even if it is in eng build. To show eUICC
preference in eng build, uses isDevelopmentSettingsEnabled() instead.

Test: Manual and make RunSettingsRoboTests

Change-Id: Ia1f46fad94bc62ca48dcfef7cd5d6188766aa380
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>