remove global figure size setting

Author: bishmaybarik

lectures/samuelson.md

@@ -49,7 +49,6 @@ Let's start with some standard imports:
 
 ```{code-cell} ipython3
 import matplotlib.pyplot as plt
-plt.rcParams["figure.figsize"] = (11, 5)  #set default figure size
 import numpy as np
 ```