Reload mathPres when reloading config (#19886)
Fixes the issue described in
https://github.com/nvaccess/nvda/issues/19811#issuecomment-4118942647
### Summary of the issue:
When the config is reset, MathCAT's settings are not restored.
### Description of user facing changes:
MathCAT settings are restored to the saved/default values when resetting
the config.
### Description of developer facing changes:
None
### Description of development approach:
`terminate()` then `initialize()` `mathPres` in
`core.resetConfiguration()`. While we could have reapplied the restored
settings to MathCAT, it is not guaranteed to be the math presentation
provider, so I thought this approach was simpler and easier to
understand and debug.
### Testing strategy:
Ran from source. Read some math with speech style set to "simple speak".
Switched to "literal speak". Read the math again. Restored settings.
Read the speech a third time and ensured it was once again "simple
speak".
### Known issues with pull request:
This approach is going to be marginally slower than reapplying MathCAT
settings if it is the running math presentation provider.
