Use max_examples/10 for unvectorized_max_examples

Previously it was log(max_examples), but this makes it very difficult to
actually run a lot of examples by increasing max_examples.

conftest.py

@@ -148,7 +148,7 @@ def pytest_collection_modifyitems(config, items):
 
     disabled_exts = config.getoption("--disable-extension")
     disabled_dds = config.getoption("--disable-data-dependent-shapes")
-    unvectorized_max_examples = math.ceil(math.log(config.getoption("--hypothesis-max-examples")))
+    unvectorized_max_examples = config.getoption("--hypothesis-max-examples")//10
 
     # 2. Iterate through items and apply markers accordingly
     # ------------------------------------------------------