Fix bugs in complex-valued contractions for direct_nosym (fix #2302) #1131

Job	Run time
linux-build (ubuntu-20.04, 3.8)	50m 7s
linux-build (ubuntu-20.04, 3.12)	43m 28s
linux-build-aarch64 (ubuntu-20.04, cp39-cp39)	7m 50s
macos-build (3.10)	23m 20s
	2h 4m 45s

Provide feedback