bug of manim color

### Describe the bug
the colour of the sphere isn't correct in manimgl

**Code**:

(.venv) niuyingkai@niuyingkaideMacBook-Air teststation % manim -qm -p --renderer=opengl test.py Practice
Manim Community v0.19.1

2025-12-15 13:21:31.287 Python[84332:3223027] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to /var/folders/rk/yn7mgjpj18nbhjnx48k9cgv80000gn/T/org.python.python.savedState
Python 3.13.8 (main, Oct 7 2025, 12:01:51) [Clang 17.0.0 (clang-1700.3.19.1)]
Type 'copyright', 'credits' or 'license' for more information
IPython 9.8.0 -- An enhanced Interactive Python. Type '?' for help.
Tip: You can use Ctrl-O to force a new line in terminal IPython

In [1]: sphere = Sphere(colour="red")

In [2]: add(sphere)

In [3]:

**Wrong display or Error traceback**:

### Additional context