Simplify bitmask creation

Separate clearnet and onion tests

http.go

@@ -147,7 +147,7 @@ func parseTags(r io.Reader) (Challenge, error) {
 					if err != nil {
 						return c, ErrParseFailed
 					}
-					c.Steps = int8(steps)
+					c.Steps = uint8(steps)
 				}
 			}
 		}