Boolean match in strict binary operands mode emits an error

https://psalm.dev/r/e58299f88a

```
ERROR: RedundantIdentityWithTrue - a.php:8:13 - The "=== true" part of this comparison is redundant (see https://psalm.dev/228)
            $item instanceof a => 'a',


ERROR: RedundantIdentityWithTrue - a.php:9:13 - The "=== true" part of this comparison is redundant (see https://psalm.dev/228)
            $item instanceof b => 'b',
```