global_config.yaml mkcert_caroot never gets updated

[rfay]

Describe the bug

The value global_config.mkcert_caroot never gets updated once it is set.

This means that if somebody (especially installing WSL2) installs with $CAROOT set wrong, it can only be fixed by removing that line. I imagine it should be updated on every ddev start ?

To Reproduce

In WSL2, do a mkcert -install and then ddev start a project (with $CAROOT unset). This will set mkcert_caroot in ~/.ddev/global_config.yaml

Now actually use setx on the Windows site to set $CAROOT correctly. ddev poweroff && ddev start. The value in global_config will not be updated.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Version and configuration information (please complete the following information):

• Host computer OS and Version: [e.g. Windows 10, macOS High Sierra]
• Docker version information (use docker version) and insert it here.
• ddev version information (use ddev version)
• config.yaml contents for the misbehaving project
• Do you have any custom configuration (nginx, php, mysql) in the .ddev folder? If so, have you tried without them?

Additional context
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