Fix CircleCI breakage in RCTPropsAnimatedNode

[PeteTheHeat]

Summary:
I changed this line in D23272735 (700960c), to conform to normal ObjC semantics: impl files can import their header by file name.

I forgot that their's some special linking logic happening in this directory that doesn't allow for this import type.

This diff just reverts one line to fix CircleCI builds.

Changelog: [Internal]

Differential Revision: D23399893

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D23399893

[pull-bot]

	Messages
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Generated by 🚫 dangerJS against 59ae529

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 6729a3e

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,208,869	0
android	hermes	armeabi-v7a	6,858,053	0
android	hermes	x86	7,643,509	0
android	hermes	x86_64	7,534,461	0
android	jsc	arm64-v8a	9,367,594	0
android	jsc	armeabi-v7a	9,008,890	0
android	jsc	x86	9,230,310	0
android	jsc	x86_64	9,807,458	0

Base commit: 6729a3e

[react-native-bot]

This pull request was successfully merged by @PeteTheHeat in b231e3a.

^{When will my fix make it into a release? | Upcoming Releases}