Remove unused import

Author: alxbilger

examples/access_mass_matrix.py

@@ -1,7 +1,6 @@
 # Required import for python
 import Sofa
 import SofaRuntime
-from Sofa import SofaLinearSolver
 from scipy import sparse
 from scipy import linalg
 from matplotlib import pyplot as plt

examples/access_stiffness_matrix.py

@@ -1,7 +1,6 @@
 # Required import for python
 import Sofa
 import SofaRuntime
-from Sofa import SofaLinearSolver
 from scipy import sparse
 from scipy import linalg
 from matplotlib import pyplot as plt