Fix the issue that previous optimization for special case (multiple same URL in prefetcher list) breaks the `queryCacheType` option sematic by dreampiggy · Pull Request #3788 · SDWebImage/SDWebImage

@dreampiggy

…ame URL in prefetcher list) breaks the `queryCacheType` option sematic

We should only do optimization on `async` disk cache query case

@dreampiggy

…ry from disk only semantic

@dreampiggy

Update the test case url, that wikipedia url seems strange on iOS unit test

@dreampiggy