just-mr fetch: fix overwriting distfiles

Both, the python script as well as the compiled variant of just-mr
fetch try to overwrite already existing distfiles in the distdir.
While it is unclear if overwriting existing distfiles or not
copying to distdir if a file with that name already exists is the
better behaviour, we at least should not error out, as the compiled
just-mr currently does as it sets permission to 444 and hence cannot
overwrite later; fix this by addwing owner write permissions before
overwriting.

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