Video format ignored when set through global `config` object

## Description of bug / unexpected behavior
It seems the video format value is being ignored when I [set it programmatically](https://docs.manim.community/en/stable/guides/configuration.html#the-manimconfig-class) through the global `config` object and generate the video through `render()`. For example, setting it to `mov` using the below example code outputs an `mp4` video.

## Expected behavior
When setting `config.format = 'mov'` I expect a `.mov` file output.

## Minimal example
```py
from manim import Scene, Circle, PINK, Create, config


class CreateCircle(Scene):
def construct(self):
circle = Circle()
circle.set_fill(PINK, opacity=0.5)
self.play(Create(circle))


if __name__ == '__main__':
config.format = 'mov'
CreateCircle().render()
```

## System specifications

System Details

- OS: macOS 12.5 (Monterey)
- Python version: 3.10.6
- Installed modules (output from `poetry show`):
```
certifi 2022.6.15
charset-normalizer 2.1.0
click 8.1.3
click-default-group 1.2.2
cloup 0.13.1
colour 0.1.5
commonmark 0.9.1
cython 0.29.32
decorator 5.1.1
glcontext 2.3.6
idna 3.3
isosurfaces 0.1.0
manim 0.16.0.post0
manimpango 0.4.1
mapbox-earcut 0.12.11
moderngl 5.6.4
moderngl-window 2.4.1
multipledispatch 0.6.0
networkx 2.8.5
numpy 1.23.2
pillow 9.2.0
pycairo 1.21.0
pydub 0.25.1
pyglet 1.5.26
pygments 2.13.0
pyobjc-core 8.5
pyobjc-framework-cocoa 8.5
pyrr 0.10.3
requests 2.28.1
rich 12.5.1
scipy 1.9.0
screeninfo 0.8
six 1.16.0
skia-pathops 0.7.2
srt 3.5.2
tqdm 4.64.0
urllib3 1.26.11
watchdog 2.1.9
```

FFMPEG

Output of `ffmpeg -version`:

```
ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
```

Start by tracing how the global config.format value is consumed when Scene.render() writes video output, then reproduce the provided example with format set to mov. Done means the program produces a .mov file rather than an .mp4, with a regression test covering programmatic configuration if the existing test structure supports it.

Written by the indexing model from the issue text.