Add two missing expectation fulfillments

It looks like two tests in FeedlySetStarredArticlesOperationTests
created but never referenced XCTestExpectation instances. Based on the
other nearby tests, add a call to `fulfill()` inside the associated
completion block after the rest of our test assertions are done.

Frameworks/Account/AccountTests/Feedly/FeedlySetStarredArticlesOperationTests.swift

@@ -257,6 +257,7 @@ class FeedlySetStarredArticlesOperationTests: XCTestCase {
 					.map { $0.articleID })
 				
 				XCTAssertEqual(idsOfStarredArticles, remainingStarredIds)
+				fetchIdsExpectation.fulfill()
 			} catch let e {
 				XCTFail("Error checking articles IDs: \(e)")
 			}
@@ -315,6 +316,7 @@ class FeedlySetStarredArticlesOperationTests: XCTestCase {
 					.map { $0.articleID })
 				
 				XCTAssertEqual(idsOfStarredArticles, remainingStarredIds)
+				fetchIdsExpectation.fulfill()
 			} catch let e {
 				XCTFail("Error checking articles IDs: \(e)")
 			}