More temp copies of test docs in Python/UITests

...similar to d76281864b0e83812c0edf7490b1e8271e89fff5 "Create temp copies of
test docs in Python/UITests", which only fixed those places that were broken
with a read-only SRCDIR.  However, I now ran into a deadlock on Linux (where
UITests are run with SAL_USE_VCLPLUGIN=svp) that suggests that /all/ documents
from SRCDIR that are opened by those tests should better first be copied to
WORKDIR sub-dirs (that are removed prior to running tests, so stale lock files
cannot exists).  This commit addresses just a small part of all those tests,
though.

I had cancelled (ctrl-c) a `make check` midway, when it happened to be in the
middle of UITest_calc_tests2 and left beind a
sc/qa/uitest/calc_tests/data/.~lock.stableSorting.ods# lock file (which records,
among other things, the host name).  I then dropped off a VPN, which caused the
host name as seen by LO to switch from "alpha" to "alpha.fritz.box", then re-
started the build as `make check screenshot` (which was the thing I'd originally
intended, but forgotten the screenshot target).  The new built hung during
UITest_calc_tests2's sc/qa/uitest/calc_tests2/stableSorting.py, as loading
sc/qa/uitest/calc_tests/data/stableSorting.ods found the lock file with non-
matching host name in SfxMedium::LockOrigFileOnDemand, and hung in
SfxMedium::ShowLockedDocumentDialog -> UUIInteractionHandler::handle -> (switch
to main thread...) -> UUIInteractionHelper::handleLockedDocumentRequest -> ...
-> Dialog::Execute, which just blocks in svp mode (which, unlike --headless,
doesn't cause Application::IsDialogCancelEnabled).

Change-Id: I999af50d6b1e5012d3978f5e476bcbfc9be6fd1d
Reviewed-on: https://gerrit.libreoffice.org/60439
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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