HeadphoneKey(runAction): Use `while` loop over `result->action`

Using `strlen` loops once over the string, so along with our `for` loop,
we have two loops over the string. No big deal since these shouldn't be
that long. But, using a `while` loop we can iterate just once.

Reference:
Alexandre C. (https://stackoverflow.com/users/373025/alexandre-c)
https://stackoverflow.com/questions/3213827/how-to-iterate-over-a-string-in-c/3213903#3213903

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