Clean up trailing whitespaces

Lib/Configurations/Tests.xcconfig

@@ -17,4 +17,4 @@ TEST_HOST[sdk=macosx*] = $(BUILT_PRODUCTS_DIR)/TestHost.app/Contents/MacOS/TestH
 
 EXCLUDED_SOURCE_FILE_NAMES[sdk=watch*] = *;
 EXCLUDED_SOURCE_FILE_NAMES[sdk=appletv*] = SharedCredentialTests.swift;
-EXCLUDED_SOURCE_FILE_NAMES[sdk=macosx*] = SharedCredentialTests.swift;
+EXCLUDED_SOURCE_FILE_NAMES[sdk=macosx*] = SharedCredentialTests.swift;