adding missing rheo coordination flag

src/RHEO/fix_rheo.cpp

@@ -70,6 +70,7 @@ FixRHEO::FixRHEO(LAMMPS *lmp, int narg, char **arg) :
   surface_flag = 0;
   oxidation_flag = 0;
   self_mass_flag = 0;
+  coordination_flag = 0;
   shift_multiphase_flag = 0;
 
   int i;

src/RHEO/fix_rheo.h

@@ -55,6 +55,7 @@ class FixRHEO : public Fix {
   int interface_flag;
   int surface_flag;
   int oxidation_flag;
+  int coordination_flag;
   int shift_multiphase_flag;
 
   int viscosity_fix_defined;