fix and rename sythetic ct example

Author: wahln

examples/matRad_example18_CT_sCT_DVH_difference_photons.m renamed to examples/matRad_example19_CT_sCT_DVH_difference_photons.m

@@ -57,7 +57,7 @@
 
 % Now, as the directories are created, let us create the DICOM data. Here, the DICOM
 % files will be created from the .mat format.
-load('Liver.mat');
+load('LIVER.mat');
 realCTct=ct;
 %review real CT volume
 matRadGUI;

test/autoExampleTest/test_examples.m

@@ -23,7 +23,7 @@
     'examples/matRad_example12_simpleParticleMonteCarlo.m',...
     'examples/matRad_example15_brachy.m',...
     'examples/matRad_example17_biologicalModels.m',...
-    'examples/matRad_example18_CT_sCT_DVH_difference_photons.m',...
+    'examples/matRad_example19_CT_sCT_DVH_difference_photons.m',...
     'matRad.m',...
     };