Delete duplicates for Java issues

[nbirillo]

Issues NeedBracesCheck and ControlStatementBraces are the same, keep only one of them:

{
  "code": "NeedBracesCheck",
  "text": "'if' construct must use '{}'s.",
  "line": "if (count == 3)",
  "line_number": 11,
  "column_number": 17,
  "category": "CODE_STYLE",
  "influence_on_penalty": 0
},
{
  "code": "ControlStatementBraces",
  "text": "This statement should have braces",
  "line": "break;",
  "line_number": 12,
  "column_number": 1,
  "category": "CODE_STYLE",
  "influence_on_penalty": 0
},