Fix serilog logging statements

[miniduikboot]

For structured logging to work properly it is necessary to add some text between the curly brackets

Test plan: Run the following command:

curl --request PUT \
 --url http://localhost:22023/api/games \
 --header 'Accept: application/json' \
 --header 'Client-Mods: 2;0'

Before: [09:50:43 ERR] Expected version "1", got "{}"
After: [09:50:43 ERR] Expected version "1", got "2"