Fix: Bad chunk padding for GLB export #395

Job	Run time
build_linux (gcc-9, NO)	3m 18s
build_linux_deprecated_extensions (gcc-9)	2m 1s
build_linux (gcc-10, NO)	2m 31s
build_linux_deprecated_extensions (gcc-10)	2m 47s
build_linux (gcc-10, YES)	2m 5s
build_windows (NO)	3m 19s
build_linux_deprecated_extensions (clang-13)	2m 59s
build_linux (clang-13, NO)	2m 58s
build_windows (YES)	4m 38s
build_windows_deprecated_extensions	4m 22s
build_linux (clang-15, NO)	2m 20s
build_linux (clang-15, YES)	2m 34s
	35m 52s

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