update telecom test apps directory (NPE & RoleManager)

There is a NPE that occurs in the testApps that causes
a fatal exception, that has been fixed.

Also, starting with T, there is a new way of requesting
to become default Dialer app (via role manager).  I updated
the button to reflect the new way of requesting permission.

bug: 226588535
Test: none
Change-Id: I49f156832b8ed0e5216939bba7fe599a6a684148