add legacy element hack for UIAA using invalid user field

see:
- https://github.com/girlbossceo/ruwuma/commit/e9302a955614429ca969eb4c7f561fc87a4f6f15
- https://github.com/element-hq/element-android/issues/8043
- https://github.com/element-hq/element-ios/issues/7405

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/main/Cargo.toml

@@ -67,6 +67,7 @@ dev_release_log_level = [
 ]
 element_hacks = [
 	"conduit-api/element_hacks",
+	"conduit-service/element_hacks",
 ]
 gzip_compression = [
 	"conduit-api/gzip_compression",