Donation dialog does not show button on standard (#371)

* Added DataStore

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Migrated to DataStore

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Using flavor-specific donation dialog if available

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Using flags since class is not accessible from other flavors

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Imports cleanup

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Fixed linting issue

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Using binary representation of int for clarity

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Fixed operation

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Renamed variables

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Fixed missing replacement

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Added `hasFlag` and comments for clarity

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Using `hasFlag`

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Added tests

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

---------

Signed-off-by: Arnau Mora <arnyminerz@proton.me>
Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>