resolve couple pedantic clippy lints, remove unnecessary qualifications

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

src/database/key_value/rooms/threads.rs

@@ -54,7 +54,7 @@ impl service::rooms::threads::Data for KeyValueDatabase {
 						)
 						.map_err(|_| Error::bad_database("Invalid UserId in threadid_userids."))
 					})
-					.filter_map(std::result::Result::ok)
+					.filter_map(Result::ok)
 					.collect(),
 			))
 		} else {