Fix flaky holder table test by increasing max function calls (#3129)

The test was failing ~5-10% of the time with 200 evaluations because
find_min_global occasionally converges to a local minimum. Increasing
to 300 evaluations eliminates flakiness while keeping the test fast.

Author: joelnn

tools/python/test/test_global_optimization.py

@@ -62,8 +62,8 @@ def holder_table(x0,x1):
     return -abs(sin(x0)*cos(x1)*exp(abs(1-sqrt(x0*x0+x1*x1)/pi)))
 
 def test_on_holder_table():
-    x,y = find_min_global(holder_table, 
-                            [-10,-10],  
-                            [10,10],   
-                            200)       
+    x,y = find_min_global(holder_table,
+                            [-10,-10],
+                            [10,10],
+                            300)       
     assert (y - -19.2085025679) < 1e-7