remove conditional on MVTB, distancexform works without it now

Author: petercorke

unit_test/PlanTest.m

@@ -53,9 +53,6 @@ function bug2_test(tc)
 
 function dxform_test(tc)
 
-    % requires MVTB
-    tc.assumeTrue( exist('imorph') == 2);
-
     nav = DXform(tc.TestData.map);
     tc.verifyInstanceOf(nav, 'DXform');