Apply dd4hep single particle momentum patch to 1.18 as well

This will be fixed in anything after 1.18 since patch was included in dd4hep master as of Sept 20, 2021, but 1.18 was tagged earlier in Sept.

spack/packages/dd4hep/package.py

@@ -56,7 +56,7 @@ class Dd4hep(CMakePackage):
     # https://github.com/AIDASoft/DD4hep/pull/851
     patch('2021-07-27.patch', when='@1.17p1')
     # patch for https://github.com/AIDASoft/DD4hep/issues/862
-    patch('0001-do-not-change-momentum-in-getParticleDirection.patch', when='@1.17p1')
+    patch('0001-do-not-change-momentum-in-getParticleDirection.patch', when='@1.17p1:1.18')
 
     variant('xercesc', default=False, description="Enable 'Detector Builders' based on XercesC")
     variant('geant4', default=False, description="Enable the simulation part based on Geant4")