MNT: Use new defaults in set_font_settings_for_testing

@tacaswell argued that downstreams will already have to contend with
changes in text due to FreeType upgrades, so keeping the old hinting
defaults doesn't really help with backwards compatibility and makes
things different for other projects for no reason.

Followup to matplotlib#30161 (review)

Author: QuLogic

lib/matplotlib/testing/__init__.py

@@ -19,15 +19,8 @@
 
 def set_font_settings_for_testing():
     mpl.rcParams['font.family'] = 'DejaVu Sans'
-    # We've changed the default for ourselves here, but for backwards-compatibility, use
-    # the old setting if not called in our own tests (which would set
-    # `_called_from_pytest` from our `conftest.py`).
-    if getattr(mpl, '_called_from_pytest', False):
-        mpl.rcParams['text.hinting'] = 'default'
-        mpl.rcParams['text.hinting_factor'] = 1
-    else:
-        mpl.rcParams['text.hinting'] = 'none'
-        mpl.rcParams['text.hinting_factor'] = 8
+    mpl.rcParams['text.hinting'] = 'default'
+    mpl.rcParams['text.hinting_factor'] = 1
 
 
 def set_reproducibility_for_testing():