Fix extended master secret implementation in tlslite

The previous cl (http://crrev.com/1306553002) didn't properly handle the field
in HandshakeSettings, resulting in extended master secret always being enabled,
regardless of what was passed in.

BUG=467312

Review URL: https://codereview.chromium.org/1301403002

Cr-Original-Commit-Position: refs/heads/master@{#344846}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b6248b5a92ab416011b4aadcb40adc83cab00c35
2 files changed