Make FunctionRef support bool operator
Summary:
To support following code:
```
void foo(folly::FunctionRef<void(void)> callback = {}) {
if (callback) {
callback();
}
}
```
Reviewed By: yfeldblum
Differential Revision: D4372296
fbshipit-source-id: 7d21e6a44b6f6b046b424f0139465511dbae7b8b
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