test: physical: Fix readability-identifier-naming

```
/home/andrew/src/openbmc/phosphor-led-sysfs/build/../test/physical.cpp:10:16: error: invalid case style for variable 'LED_OBJ' [readability-identifier-naming,-warnings-as-errors]
constexpr auto LED_OBJ = "/foo/bar/led";
               ^~~~~~~
               ledObj
```

Change-Id: I048eb89444702cf6bc5233f9b0e368908b134816
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
1 file changed