WordPressClient with HttpClient posts to incorrect URL

[ChivanTiebosch]

When using the WordPressClient(HttpClient httpClient, string defaultPath = DEFAULT_PATH) constructor the WordPressUri is set based on the httpClient.BaseAddress and a trailing / is added. However, the httpClient passed to the HttpHelper still has the URI without the leading "/" (valid URI format needs to be this). Therefore the generated URLs in the Client based on DEFAULT_PATH (changeable) and _jwtPath (read-only) are incorrect.