Fixes issue #3195

The new string extension method ToHttpsUrl ensures that URLs starting with "https" are no longer turned into "httpss"
The commit also replaces all occurances of the error prone .Replace("http", "https") in the whole solution.

src/Ombi.Helpers/StringHelper.cs

@@ -128,5 +128,10 @@ namespace Ombi.Helpers
         {
             return string.Concat(str.Where(c => !chars.Contains(c)));
         }
+
+        public static string ToHttpsUrl(this string currentUrl)
+        {
+            return currentUrl.Replace("http://", "https://");
+        }
     }
 }