[wrt]Delete Crosswalk_wrt_BFT.conf for wrt-packertool-tizen-tests

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 3, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 3 , Fail 0, Blocked 0
Merge pull request #610 from linshen/update-usecase-tizen

[wrt]update Crosswalk_wrt_BFT.conf to Crosswalk_sharemode.conf