Bug: Stuck on Fahrenheit

### Describe the bug
The temp in the theme seems 'stuck' on Fahrenheit, even though `set -g @dracula-show-fahrenheit false` is set.

The way to fix this is to run `tmux source .tmux.conf`

### To Reproduce
Steps to reproduce the behavior:
1. run theme standard, no modification, except for the above mentioned set -g
2. temp should show in F
3. run `tmux source .tmux.conf`
4. it changes then.

### Expected behavior
Display temp in C as set in .tmux.conf

### Screenshots

### System
- OS: MacOS 12.6.5
- Tmux Version:

Start by reproducing the issue with tmux using `set -g @dracula-show-fahrenheit false`, then compare the initial configuration load with `tmux source .tmux.conf`. Trace how the temperature setting is read from `.tmux.conf`; done means the display shows Celsius immediately after startup without manually sourcing the configuration.

Written by the indexing model from the issue text.