UPBGE: Fix physics shape reinstancing.

Previously the vertex remap was resized with default value to -1 but if
this list wasn't empty the previous value were kept. To initialize all
values to -1 std::fill is used.

Fix issue: #622.

source/gameengine/Physics/Bullet/CcdPhysicsController.cpp

@@ -1806,7 +1806,9 @@ bool CcdShapeConstructionInfo::UpdateMesh(KX_GameObject *gameobj, RAS_MeshObject
 	}
 
 	m_vertexArray.resize(numVertices * 3);
-	m_vertexRemap.resize(numVertices, -1);
+	m_vertexRemap.resize(numVertices);
+	// resize() doesn't initialize all values if the vector wasn't empty before. Prefer fill explicitly.
+	std::fill(m_vertexRemap.begin(), m_vertexRemap.end(), -1);
 
 	// Current vertex written.
 	unsigned int curVert = 0;