WiFiServiceImpl (Windows): Fixed wrong authentication type with WEP-PSK.
WiFiServiceImpl (Windows): Fixed wrong authentication type with WEP-PSK.

Previously the "authentication" field was set to "open" when using
WEP-PSK security, which seems to be a copy-paste error. It should be set
to "WEP".

BUG=506445,505319

Review URL: https://codereview.chromium.org/1212173003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337561}

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