Fixed several mistakes in rtkForwardWarpImageFilter. Only has an impact if output's metadata is different from input's
Fixed several mistakes in rtkForwardWarpImageFilter.
Only has an impact if output's metadata is different from input's

ipsusila/RTK,SimonRit/RTK,dsarrut/RTK,ldqcarbon/RTK,ipsusila/RTK,dsarrut/RTK,fabienmomey/RTK,fabienmomey/RTK,ldqcarbon/RTK,ipsusila/RTK,fabienmomey/RTK,ldqcarbon/RTK,dsarrut/RTK,dsarrut/RTK,SimonRit/RTK,fabienmomey/RTK,ldqcarbon/RTK,dsarrut/RTK,ipsusila/RTK,dsarrut/RTK,SimonRit/RTK,ldqcarbon/RTK,fabienmomey/RTK,fabienmomey/RTK,ldqcarbon/RTK,fabienmomey/RTK,ipsusila/RTK,ipsusila/RTK,dsarrut/RTK,SimonRit/RTK,ipsusila/RTK,ldqcarbon/RTK