TPC addHits: remove short type limitation

Change type from short to float to remove possible overflow errors

There is no deep reason for this to be short in any case. The underlaying
storage was already of type float.

Fixes a problem observed in monopole simulations inside TPC

Author: sawenzel

Detectors/TPC/simulation/include/TPCSimulation/Point.h

@@ -117,7 +117,7 @@ class HitGroup : public o2::BaseHit
 
   ~HitGroup() = default;
 
-  void addHit(float x, float y, float z, float time, short e)
+  void addHit(float x, float y, float z, float time, float e)
   {
 #ifdef HIT_AOS
     mHits.emplace_back(x, y, z, time, e);