test-strip: fix call to super class in crashstriprepo
The 'self' argument is already taken care of by the 'super(...)' call. Instead
we were passing the repository instance as the 'desc' value.
This got discovered by breaking the next changeset.
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ ls
a
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
B should disappear
$ ls
a