Change python issues categories

[nbirillo]

Change CODE_STYLE into BEST_PRACTICES for python issues:

{
  "code": "WPS519",
  "text": "Found implicit `sum()` call",
  "line": "for i in range(len(p)):",
  "line_number": 21,
  "column_number": 5,
  "category": "BEST_PRACTICES",
  "influence_on_penalty": 0
}

and

{
  "code": "C0200",
  "text": "Consider using enumerate instead of iterating with range and len",
  "line": "for j in range(len(dictionary)):",
  "line_number": 27,
  "column_number": 9,
  "category": "CODE_STYLE",
  "influence_on_penalty": 0
}