v23_RELEASE_BRANCH: Use lalsim for TD_from_FD (gwastro#4530)

* Waveform fix

* A bit more flexible

Apparently the tests need a TD version of TaylorF2!

pycbc/waveform/waveform.py

@@ -1159,7 +1159,8 @@ def td_fd_waveform_transform(approximant):
         # We can also make a td version of this
         # This will override any existing approximants with the same name
         # (ex. IMRPhenomXX)
-        cpu_td[approximant] = get_td_waveform_from_fd
+        if approximant not in td_apx:
+            cpu_td[approximant] = get_td_waveform_from_fd
 
 for apx in copy.copy(_filter_time_lengths):
     td_fd_waveform_transform(apx)