AbstractShadowRenderer: fix displayFrustum #3731

Job	Run time
Build natives for android	1m 55s
Build natives for iOS	2m 37s
Run Screenshot Tests	1m 32s
Build on ${{ matrix.osName }} jdk${{ matrix.jdk }}	0s
Deploy Java Snapshot	0s
Deploy Javadoc	0s
Deploy Release	0s
Deploy native snapshot	0s
Run Screenshot Tests	1m 27s
Build natives for android	1m 55s
Build on ${{ matrix.osName }} jdk${{ matrix.jdk }}	-29s
Deploy Javadoc	-29s
Deploy native snapshot	-29s
Deploy Release	-29s
Deploy Java Snapshot	-29s
Build natives for iOS	2m 37s
Build natives for android	2m 5s
Run Screenshot Tests	1m 27s
Build natives for iOS	2m 37s
Build on ${{ matrix.osName }} jdk${{ matrix.jdk }}	-1s
Deploy Javadoc	0s
Deploy Release	0s
Deploy native snapshot	0s
Deploy Java Snapshot	0s
	15m 46s

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