remove some leftovers (+) from code merging

Signed-off-by: Wolfgang Ludwig <wolfgang.ludwig@esrf.fr>

5_reconstruction/GtAssembleVol3D.m

@@ -849,10 +849,10 @@ classdef GtAssembleVol3D < handle
 
             % Sample translation
             sample_shift = obj.localPar.sample_shift;
-+           sample_shift_size = size(sample_shift);
-+           if sample_shift_size(2)<3
-+               sample_shift = [0, 0, 0];
-+           end
+           sample_shift_size = size(sample_shift);
+           if sample_shift_size(2)<3
+               sample_shift = [0, 0, 0];
+           end
 
 
             % the bbox extremes start from 0 ad not from 1 (matlab coords).