tests: fix hooks in `test-transaction-rollback-on-revlog-split.t` for Windows A few problems with external hooks here: 1) `cmd.exe` is blissfully unaware of the meaning of single quotes, and passes them along as part of the revision arg 2) `cmd.exe` doesn't know how to run the python script `f` with the shebang line, so it needs to be invoked with the intepreter explicitly. Then for some reason it was trying to open `$TESTTMP\troffset-computation-hooks\f`, so make it an absolute path. 3) Likewise, the shell script `wait-on-file` cannot be invoked directly by `cmd.exe`. 4) Windows python doesn't understand whatever `$TESTTMP` unrolls to (probably it has the double backslashes), and silently failed to write the lock file. I'm assuming that `pretxnclose.03-abort` is also bad (there's no `false` in `cmd.exe`), but it's not currently causing problems. Also note that the paths in this are very long, and typically exceed the `MAX_PATH` limit in Windows. It can be run with `run-tests.py --tmpdir /c/t`.