Corrected bug with replacing #rx_box command for 3D models.

tools/inputfile_old2new.py

@@ -148,9 +148,12 @@ while(lindex < len(inputlines)):
             if model2D:
                 # Syntax of old command: #rx_box: x1 y1 x2 y2 dx dy
                 replacement = '#rx_array: {} {} {} {} {} {} {} {} {}'.format(params[0], params[1], 0, params[2], params[3], dx_dy_dz[2], params[4], params[5], dx_dy_dz[2])
-                print("Command '{}', replaced with '{}'".format(inputlines[lindex], replacement))
-                inputlines.pop(lindex)
-                inputlines.insert(lindex, replacement)
+            else
+                # Syntax of old command: #rx_box: x1 y1 z1 x2 y2 z2 dx dy dz
+                replacement = '#rx_array: {} {} {} {} {} {} {} {} {}'.format(params[0], params[1], params[2], params[3], params[4], params[5], params[6], params[7], params[8])
+            print("Command '{}', replaced with '{}'".format(inputlines[lindex], replacement))
+            inputlines.pop(lindex)
+            inputlines.insert(lindex, replacement)
             lindex += 1
 
         elif cmdname == '#tx_steps':