Fix new line charactor in field metrics trace
Fix new line charactor in field metrics trace

Summary:
Fix the minor formatting glitches in the trace for fields.
```
Running CheckBreadcrumbsPass...
Dangling References in Fields: 2Dangling References in Methods: 4
Dangling References in Type Instructions: 10
Dangling References in Fields Field Instructions: 0
Dangling References in Method Instructions: 0
Illegal fields : 20Illegal type refs : 76
Illegal field type refs : 29
Illegal field cls refs : 70
Illegal method calls : 256
```

Differential Revision: D15950902

fbshipit-source-id: 5e5ceb0c991334d35926176d8f1af88393c5c06d

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex