Make order of UITest *.py test file processing deterministic

...hoping that this can prevent issues like the one seen with
1b0eb76eb1787d9d9fbd7a7a73ee8ae47b62dc33 "tdf#137617: sc: Add UItest" followed
by d1232ee6b5e5cc3c811ef3ad72c83e9bd884bfe3 "uitest: reset formula syntax back
to Calc A1" (i.e., where the first commit's Gerrit Jenkins build had apparently
only succeeded because it happened to run the tests in one specific order,
different from the order in which later, failing builds ran it)

Change-Id: I4f1b5ada10d60e77b45a0edeb89069fe9376b63e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/105325
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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