Fix Prism rendering with wrong dimensions in OpenGL (#4003)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Benjamin Hackl <[email protected]>
Co-authored-by: Francisco Manríquez Novoa <[email protected]>

Author: 4 people

manim/mobject/three_d/three_dimensions.py

@@ -517,7 +517,8 @@ def generate_points(self) -> None:
 
             self.add(face)
 
-    init_points = generate_points
+    def init_points(self) -> None:
+        self.generate_points()
 
 
 class Prism(Cube):