Fixed error in render function for CustomActionMaskedEnvironment Class #1120

Job	Run time
agilerl-tutorial-test (3.9, AgileRL)	14m 0s
agilerl-tutorial-test (3.10, AgileRL)	14m 51s
agilerl-tutorial-test (3.11, AgileRL)	16m 34s
tutorial-test (3.8, Tianshou)	4m 11s
tutorial-test (3.8, CustomEnvironment)	1m 0s
tutorial-test (3.8, CleanRL)	5m 21s
tutorial-test (3.8, SB3/kaz)	4m 9s
tutorial-test (3.8, SB3/waterworld)	8m 18s
tutorial-test (3.8, SB3/connect_four)	1m 52s
tutorial-test (3.8, SB3/test)	2m 7s
tutorial-test (3.9, Tianshou)	3m 19s
tutorial-test (3.9, CustomEnvironment)	29s
tutorial-test (3.9, CleanRL)	5m 23s
tutorial-test (3.9, SB3/kaz)	4m 27s
tutorial-test (3.9, SB3/waterworld)	7m 36s
tutorial-test (3.9, SB3/connect_four)	2m 8s
tutorial-test (3.9, SB3/test)	2m 11s
tutorial-test (3.10, Tianshou)	3m 20s
tutorial-test (3.10, CustomEnvironment)	27s
tutorial-test (3.10, CleanRL)	7m 18s
tutorial-test (3.10, SB3/kaz)	4m 53s
tutorial-test (3.10, SB3/waterworld)	8m 33s
tutorial-test (3.10, SB3/connect_four)	1m 59s
tutorial-test (3.10, SB3/test)	2m 4s
tutorial-test (3.11, Tianshou)	3m 12s
tutorial-test (3.11, CustomEnvironment)	26s
tutorial-test (3.11, CleanRL)	7m 7s
tutorial-test (3.11, SB3/kaz)	4m 56s
tutorial-test (3.11, SB3/waterworld)	8m 9s
tutorial-test (3.11, SB3/connect_four)	2m 0s
tutorial-test (3.11, SB3/test)	2m 4s
	2h 34m 24s

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