xcode-select should use --print-path flag

## motivation

Calabash users are reporting:

```
xcode-select: Error: unknown command option '-p'.
```

I cannot reproduce locally, but it has been reported multiple times.

I have not been able to pin this a particular version of MacOS, command-line tools, or Xcode.

I am stumped.

I did a grep over ios-sim and calabash for `xcode-select -p` and I believe that sim_launcher is the only place `-p` is used.