Update name of "BULLM_ExtendMotor"

Author: per1234

registry.txt

@@ -8280,5 +8280,5 @@ https://github.com/phuongnamzz/HLK-LD2410S.git|Contributed|HLK-LD2410S
 https://github.com/danel32/Arduino-Library-for-MAX7300.git|Contributed|MAX7300
 https://github.com/SpaceTrekKSC/MakerBox.git|Contributed|SpaceTrek MakerBox
 https://github.com/mirosieber/OPT300x.git|Contributed|OPT300x
-https://github.com/bull-m/BULLM-Extend-Motor.git|Contributed|BULLM-Extend-Motor
+https://github.com/bull-m/BULLM-Extend-Motor.git|Contributed|BULLM_ExtendMotor
 https://github.com/esharp17/Mecanum_Base.git|Contributed|MecanumBase