Incorrect copyright detection in BusyBox 1.37.0

### Description

The copyright (or author) statement at:

https://github.com/mirror/busybox/blob/master/coreutils/env.c#L20

is detected as:

```
{
"copyright": "(c) 2003 - correct",
"start_line": 20,
"end_line": 21

```

which is, obviously, incorrect (pun intended).
### How To Reproduce

> Tell us how to reproduce the issue.

### System configuration

> For bug reports, it really helps us to know:

* What OS are you running on? (Windows/MacOS/Linux): Linux
* What version of scancode-toolkit was used to generate the scan file? Git 7dbb3c7ac295a51547735c0107d2252f0dfccaa7
* What installation method was used to install/run scancode? (pip/source download/other): source