fix rerun failed bug

[jnhyperion]

example.zip Run test with this example: robot . there will be 3 failed tests

then rerun the failed tests with command: robot --prerunmodifier DataDriver.rerunfailed:output.xml --output rerun.xml .

4 tests will be reran.

there's one passed test "example.test.tc1" is incorrectly selected due to the same name with the real failed test.

We should use test longname instead of the partial name to match the failed test