feat(frontend-python): fix key value database example

[umut-sahin]

(closes #865)

[bcm-at-zama]

Thx. Should be reviewed by someone from the team, I think (more than by me)

[bcm-at-zama]

By the way, could we have tests of the examples in the CI, please? I already made an issue for it, I can find it

[BourgerieQuentin]

Just please change the base to release/v2.7.0

[umut-sahin]

By the way, could we have tests of the examples in the CI, please? I already made an issue for it, I can find it

Can we do this in a separate PR? I think we shouldn't copy the example code into our tests (as it'd be duplication and hard to manage), instead we can just run the scripts and make sure it exits without any assertion errors.

Wdyt?

[bcm-at-zama]

Yes it can be in a further PR but we shouldn't delay this further PR too late please.

To me, it's not about copying some code: it's about launching the different .py / .sh in the example directories, and checking it's green (in the CI). So, another action to set

[umut-sahin]

Sure, let's create another PR to run the examples!