Use string concatenation for CREATE_TABLE_SQL instead of StringBuilder()

The current implementation is easy to read but causes klippy warnings.
Also removed the AnnotatedCallLogDatabaseHelperTest.voicemailColumnsExist and combined it with the onCreate Test

Test: Unit Test
PiperOrigin-RevId: 173614534
Change-Id: If00f7e91f48e582aa481268d88a4871cc2364684
1 file changed