Fix animated textures updater

[TheDuckCow]

Fixed the reference which was causing a failure, and improve the tests to more directly check for an animated sequence node output.

All tests passing:

-------------------------------------------------------------------------------
bversion   	ran_tests	ran	skips	failed	errors
-------------------------------------------------------------------------------
(3.6.2)   	all_tests	35	2	0	No errors
(4.0.0)   	all_tests	35	2	0	No errors
(3.5.1)   	all_tests	35	2	0	No errors
(3.4.0)   	all_tests	35	2	0	No errors
(3.3.1)   	all_tests	35	2	0	No errors
(3.2.1)   	all_tests	35	2	0	No errors
(3.1.0)   	all_tests	35	2	0	No errors
(3.0.0)   	all_tests	35	2	0	No errors
(2.93.0)   	all_tests	35	2	0	No errors
(2.90.1)   	all_tests	35	2	0	No errors
(2.80.75)   	all_tests	34	3	0	No errors
tests took 204s to run

[StandingPadAnimations]

👍

I'm concerned about the amount of enums that had to be fixed for arguments though, I'm not sure how those made it past.