web: prevent TypeError thrown when using the diffstat templates
Remove the lambda used to wrap webutil.diffstat because:
- functions passed to the templater must accept keyword arguments
- webutil.diffstat is a generator, so already calculates the diffstat lazily
This reverts the changes made to 1d3e2349304a after it was submitted to the
mailing list but before it was queued.
(binary:application/octet-stream)