filterx/filterx-scope: don't move the variables array multiple times #1374

Job	Run time
create-source-tarball	1m 55s
create-packages / almalinux-8	4m 21s
create-packages / almalinux-9	7m 31s
create-packages / debian-bookworm	6m 22s
create-packages / debian-testing	6m 17s
create-packages / fedora-41	7m 52s
create-packages / ubuntu-noble	8m 43s
	43m 1s

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