Reactivated the cache mechanism for hal_tomo syntetic data creation

nabu/preproc/tests/test_alignment.py

@@ -79,7 +79,7 @@ def get_cor_data_half_tomo():
     datasource = ExternalResources(project="nabu", url_base=None)
     myfile = os.path.join(datasource.data_home, "data_for_ht_cor.h5")
 
-    if True or not os.path.isfile(myfile):
+    if not os.path.isfile(myfile):
         im1, im2, cor = _get_challenging_ImsCouple_for_halftomo_cor()
         f = h5py.File(myfile, "w")
         f["im1"] = np.array(im1, "f")