Fix `perspective_viewer::restore` calls blurring #1137

Job	Run time
lint_and_docs (ubuntu-22.04, 3.9, 20.x)	9m 5s
build_js (ubuntu-22.04, 3.9, 20.x)	37m 20s
build_and_test_rust (ubuntu-22.04, x86_64, 20.x, false)	10m 20s
build_emscripten_wheel (ubuntu-22.04, x86_64, 3.9, 20.x)	24m 14s
build_python (ubuntu-22.04, x86_64, 3.9, 20.x, false)	19m 21s
test_python (ubuntu-22.04, x86_64, 3.9, 20.x, false)	1m 18s
test_emscripten_wheel (ubuntu-22.04, x86_64, 3.9, 20.x)	2m 51s
build_and_test_jupyterlab (ubuntu-22.04, x86_64, 3.9, 20.x, false)	1m 23s
test_js (ubuntu-22.04, 3.9, 20.x)	6m 22s
benchmark_js	0s
benchmark_python	0s
test_python_sdist	0s
publish	0s
	1h 52m 14s

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