Check for excessive brackets in conditions statements

From @fredemmott:

>the typechecker takes it as a "i know what I'm doing" hint in some situations, e.g. when assigning in an if condition

Example:

```
if (($foo === true) && ($bar === false)) {
```

Versus:

```
if ($foo === true && $bar === false) {
```

A quick skim of the codebase show the less optimal conditions are in use a few dozen times (at least).