CPlayerEnergyDrain: Initialize x10_energyDrainTime on construction

GM8E v0 initializes this to zero when constructing the class. This also
makes the entire class have a consistent initial state.

Runtime/World/CPlayerEnergyDrain.hpp

@@ -9,7 +9,7 @@ namespace urde {
 class CStateManager;
 class CPlayerEnergyDrain {
   std::vector<CEnergyDrainSource> x0_sources;
-  float x10_energyDrainTime;
+  float x10_energyDrainTime = 0.0f;
 
 public:
   CPlayerEnergyDrain(u32);