Make sure framerate is 30 for previewed scenes

Author: 3b1b

manimlib/scene/scene.py

@@ -45,6 +45,7 @@ def __init__(self, **kwargs):
             from manimlib.window import Window
             self.window = Window(scene=self, **self.window_config)
             self.camera_config["ctx"] = self.window.ctx
+            self.camera_config["frame_rate"] = 30  # Where's that 30 from?
         else:
             self.window = None