[clang-tidy] enhance modernize-use-bool-literals to check ternary operator

modernize-use-bool-literals doesn't checks operands in ternary operator.

For example:

``` c++
static int Value = 1;

bool foo() {
  bool Result = Value == 1 ? 1 : 0;
  return Result;
}

bool boo() {
  return Value == 1 ? 1 : 0;
}
```

This issue was reported in bug 28854. The patch fixes it.

Reviewers: alexfh, aaron.ballman, Prazek

Subscribers: Prazek, Eugene.Zelenko

Differential Revision: https://reviews.llvm.org/D23243

llvm-svn: 278022