remove trailing whitespace

src/USER-DRUDE/pair_thole.cpp

@@ -367,10 +367,10 @@ double PairThole::single(int i, int j, int itype, int jtype,
 {
   double r2inv,rinv,r,phicoul;
   double qi,qj,factor_f,factor_e,dcoul,asr,exp_asr;
-   
+
   // single() has no information about topology or Drude particles.
   // Charges qi and qj are defined by the user (or 1.0 by defaut)
-  
+
   qi = atom->q[i];
   qj = atom->q[j];