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jrfnl 
Generic/RequireExplicitBooleanOperatorPrecedence: remove
unreachable condition

This commit reverts the changes to the
`Generic.CodeAnalysis.RequireExplicitBooleanOperatorPrecedence` sniff
introduced in
https://github.com/PHPCSStandards/PHPCSExtra/pull/271/commits/7b38efb98.
The sniff's tests remain relevant, so they were preserved.

The original commit was added to fix false positives that the sniff was
triggering when handling boolean operators inside a match (see
https://github.com/PHPCSStandards/PHPCSExtra/pull/271#pullrequestreview
-1634348864 and
https://github.com/PHPCSStandards/PHPCSExtra/pull/271#issuecomment-1729104556
). Example:

```php
match (true) {
    $a || ($b && $c) => true,
};
```

I believe the false positive was actually caused by a bug in
`File::findStartOfStatement()`. This bug was then fixed in
https://github.com/PHPCSStandards/PHP_CodeSniffer/pull/502/commits/b82438f2e
which rendered the changes to the sniff itself unnecessary and the
removed condition unreachable.

Before this fix, when processing the code example above,
`File::findStartOfStatement()` returned the variable `$a` as the
start of the statement for the `&&` boolean operator. This meant that
`$previous` would be set to `||` and the removed condition would be
needed to ensure the sniff would bail instead of triggering an error.

After this fix, `File::findStartOfStatement()` returns `$b` as the start
of the statement and then `$previous` is set to `false` and the sniff
bails before reaching the removed condition.

Including `Tokens::$blockOpeners` in
`RequireExplicitBooleanOperatorPrecedenceSniff::$searchTargets` was
necessary only for the removed condition, so it was removed as well.

18583 of 27269 relevant lines covered (68.15%)

22.28 hits per line

Source Files on job php-7.2-custom-ini-true - 11545068143.2