Update code_mobject.py

fix miss import
same as first code

manim/mobject/text/code_mobject.py

@@ -21,6 +21,7 @@
 from manim.constants import *
 from manim.mobject.geometry.arc import Dot
 from manim.mobject.geometry.shape_matchers import SurroundingRectangle
+from manim.mobject.mobject import override_animate
 from manim.mobject.opengl.opengl_compatibility import ConvertToOpenGL
 from manim.mobject.text.text_mobject import Paragraph
 from manim.mobject.types.vectorized_mobject import VGroup, VMobject