[iOS] Remove invalidate observer instead of re-adding observer in DeviceInfo module

[zhongwuzw]

Summary:

Previous fix brings in https://github.com/facebook/react-native/pull/42396. Seems it's a mistake to re-add observer? So let's remove it and also not invalidate method not be called twice.

Changelog:

[IOS] [FIXED] - Remove invalidate observer instead of re-adding observer in DeviceInfo module

Test Plan:

Fix for #42120 also works.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	18,877,269	-9
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	22,250,201	+4
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 220588004b100717b0984bf33a48391746ecd3ff Branch: main

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[github-actions[bot]]

This pull request was successfully merged by @zhongwuzw in 91279a822be949051866a694148e509c1308035b.

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