Fix crash when component is added to the circuit

This resolves bug reported in Debian BTS #493692
(cherry picked from commit 9b4c84b2f0)

src/electronics/simulation/matrix.cpp

@@ -288,7 +288,7 @@ void Matrix::displayLU()
 Map::Map( const uint size )
 {
 	m_size = size;
-	m_map = new ETMap( m_size );
+	m_map = new ETMap( m_size, std::vector<uint>( m_size ) );
 	reset();
 }