Fix `perspective_viewer::restore` calls blurring #1138

Job	Run time
lint_and_docs (ubuntu-22.04, 3.9, 20.x)	8m 52s
build_js (ubuntu-22.04, 3.9, 20.x)	34m 37s
build_python (ubuntu-22.04, x86_64, 3.9, 20.x, false)	18m 57s
build_and_test_rust (ubuntu-22.04, x86_64, 20.x, false)	10m 3s
build_emscripten_wheel (ubuntu-22.04, x86_64, 3.9, 20.x)	17m 10s
test_emscripten_wheel (ubuntu-22.04, x86_64, 3.9, 20.x)	2m 46s
test_python (ubuntu-22.04, x86_64, 3.9, 20.x, false)	1m 26s
test_js (ubuntu-22.04, 3.9, 20.x)	5m 26s
build_and_test_jupyterlab (ubuntu-22.04, x86_64, 3.9, 20.x, false)	1m 32s
benchmark_python	0s
benchmark_js	0s
test_python_sdist	-1s
publish	0s
	1h 40m 48s

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