[REF] [Import] Trivial - simplify variables

[eileenmcnaughton]

Rather than repetitively using the long access assign these to variables - note that these variables will be loaded from the mapper rather than the weird array in the near future (a few more open PRs need merging to clear the way)

    $locationTypeID = $this->_activeFields[$i]->_hasLocationType;
      $phoneTypeID = $this->_activeFields[$i]->_phoneType;
      $imProviderID = $this->_activeFields[$i]->_imProvider ?? NULL;
      $websiteTypeID = $this->_activeFields[$i]->_websiteType ?? NULL;

      $importedValue = $this->_activeFields[$i]->_value;

[civibot]

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