/wiki added in init and calls leads to wrong urls

[Mooreel]

When I tried using the get_content_template method, I saw that the URL contains wiki/wiki/..

The url in the call(s) includes wiki/ and the init always adds wiki to the baseURL for cloud instances.

if ("atlassian.net" in url or "jira.com" in url) and ("/wiki" not in url):
       url = AtlassianRestAPI.url_joiner(url, "/wiki")

def get_content_template(self, template_id):
       url = "wiki/rest/api/template/{template_id}".format(template_id=template_id)

[Mooreel]

Saw that this is the content of PR #863 (review)