Emit while_true lint spanning the entire loop condition

The lint that suggests `loop {}` instead of `while true {}` has functionality to 'pierce' parenthesis
in cases like `while (true) {}`. In these cases, the emitted span only went to the hi of the `true`
itself, not spanning the entire loop condition.

Before:
```
warning: denote infinite loops with `loop { ... }`
 --> /tmp/foobar.rs:2:5
  |
2 |     while ((((((true)))))) {}
  |     ^^^^^^^^^^^^^^^^ help: use `loop`
  |
  = note: `#[warn(while_true)]` on by default
```

After:
```
warning: denote infinite loops with `loop { ... }`
 --> /tmp/foobar.rs:2:5
  |
2 |     while ((((((true)))))) {}
  |     ^^^^^^^^^^^^^^^^^^^^^^ help: use `loop`
  |
  = note: `#[warn(while_true)]` on by default
```

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