pytester: parseconfigure: remove duplicate config._ensure_unconfigure

[blueyed]

This gets done in parseconfig already.

[nicoddemus]

Good catch, thanks.

IIUC the second call was harmless and would do nothing, right?

    def _ensure_unconfigure(self):
        if self._configured:
            self._configured = False
            self.hook.pytest_unconfigure(config=self)
            self.hook.pytest_configure._call_history = []
        while self._cleanup:
            fin = self._cleanup.pop()
            fin()

If not, we should write a CHANGELOG entry because we are fixing an external behavior.

[blueyed]

Shouldn't make a difference, because they are added just after each other.