Fix build-tests make path as well

quad/ip_repo/Makefile

 build-tests: 
 	(cd pwm_recorder_1.0/ && make build-tests)
-	(cd pwm_sigal_out_1.0/ && make build-tests)
+	(cd pwm_signal_out_1.0/ && make build-tests)
 
 run-tests:
 	(cd pwm_recorder_1.0/ && make run-tests)