[Exe] Add shellexec flag

[annd22]

• My windows app need admin privilege to run
• After setup and start app get the error
  https://stackoverflow.com/questions/4188914/the-requested-operation-requires-elevation-message-after-setup
• Please add an option for this fix

[cybrox]

You can add whatever you want to the inno setup configuration, currently, flutter_distributor just doesn't tell you that you can provide your own config. (I'll see where I can PR this).

1. Add script_template: inno_setup.iss to your windows/packaging/exe/make_config.yaml
2. Copy the template into a new file inno_setup.iss in the same directory
3. Add whatever additional Inno Setup configuration you need.

This should make it possible to solve your problem.

[annd22]

Thank you, that works!!! 🎉