Fix an issue where defaultLinesDiffComputer does not pass in the timeout variable

[CharlesHGong]

Fixes #213034

This caller is missing to pass in the timeout variable.
Otherwise it won't respect the maxComputationTimeMs option that was passed in in computeDiff

The definition of the myersDiffingAlgorithm.compute looks like this

compute(seq1: ISequence, seq2: ISequence, timeout: ITimeout = InfiniteTimeout.instance)

[CharlesHGong]

cc @hediet the last editor of the line.

[hediet]

Thanks!