After email was recognised as a supported provider type, the existing
rejection assertion for unsupported types incorrectly included email
in its denial list, causing a nil-dereference panic.
- Remove email from the unsupported-type rejection list and cover it
in the accepted-types path instead
- Correct allFeaturesEnabled fixture to set email flag to true, keeping
the fixture semantically consistent with all other service flags
2f83526966