Fix only show add-on incompatibility warning to only show when updating to an incompatible API (#17506)
Closes #17490
Fix up of #17370
Summary of the issue:
NVDA still presents the add-on incompatibility message in some situations when updating to a backwards-compatible add-on API with incompatible add-ons installed.
Description of user facing changes
The add-on incompatibility message should no-longer be presented when updating to a backwards-compatible add-on API.
Description of development approach
Updated the logic in `UpdateAskInstallDialog` to match the new logic in `UpdateResultDialog`, so they both only present the warning when updating to a backwards-incompatible API and incompatible add-ons are installed.
Testing strategy:
Tested from source while spoofing to allow update checks, with version (and addon backcompat) set to 2025.1 and 2024.1 (to simulate both situations).
Known issues with pull request:
None.