New stm.info API service updates > duplicates

[mmathieum]

org.mtransit.android.commons.provider.ca.info.stm.StmInfoServiceUpdateProvider

Same service updates appear multiple times.

[mmathieum]

The real & primary issue was using a different agency source ID for creating and deleting the service updates (since the new provider is re-using some code from the old one)
#96 (review)