Improve resetting slipstream

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@9408 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/graphics/slip_stream.cpp

@@ -129,6 +129,7 @@ SlipStream::~SlipStream()
 void SlipStream::reset()
 {
     m_slipstream_mode = SS_NONE;
+    m_slipstream_time = 0;
 }   // reset
 
 //-----------------------------------------------------------------------------

src/karts/kart.cpp

@@ -483,6 +483,8 @@ void Kart::reset()
         m_camera->setInitialTransform();
     }
 
+    m_slipstream->reset();
+    
     // Reset animations and wheels
     m_kart_model->reset();