fix whitespace and linter

Author: Sabrina Hernandez

PWGCF/Flow/Tasks/flowZdcTask.cxx

@@ -40,7 +40,7 @@
 #include <cmath>
 #include <complex>
 #include <vector>
-#include <string> 
+#include <string>
 
 using namespace o2;
 using namespace o2::framework;