There were a couple strings containing \(. That is not a valid escape
sequence in Python. The escape sequence was meant for GStreamer, and as
such either the backslash should be doubled or a raw string must be
used. This patch uses the latter for readability.
Python 3.13 will print a warning when a invalid escape sequence in a
string is found.
As a drive-by fix, this patch fixes fixes whitespace issues in the file
to make the Python linter happy.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8015>