Skip emergency number check for SmsUsageMonitorShortCodeTest

Emergency number list is currently not country-specific,
and subject to change from different sources. This would bring the
collisions such that the number which is not an emergency number in
the test would be treated as an emergency number; this causes the
test failure.

Test: sanity (not having Russian device)
Bug: 76115059
Bug: 137921586
Change-Id: Id094a4aa13a60a48fd74713deaba6d74728837c0
Merged-In: Id094a4aa13a60a48fd74713deaba6d74728837c0
(cherry picked from commit 7f8dee82)