ProhibitUnusedImport fails in conditional operator ?: with concatenation

It fails like this

```
$ perlcritic --noprofile --single TooMuchCode::ProhibitUnusedImport
use Foo qw(bar);
my $a = 1 ? 'prefix-'. bar : 'noop';
Unused import: bar at line 1, column 5. A token is imported but not used in the same code. (Severity: 1)
```

But works in other combinations:

```
$ perlcritic --noprofile --single TooMuchCode::ProhibitUnusedImport
use Foo qw(bar);
my $a = 1 ? 'noop' : 'prefix-'. bar ;
source OK
```
```
$ perlcritic --noprofile --single TooMuchCode::ProhibitUnusedImport
use Foo qw(bar);
my $a = 1 ? bar . '-suffix' : 'noop';
source OK
```