Roman Rädle d2f83d0d54 [sam2][demo][1/x] Remove adding object constraint after popagation
Summary:

PR #486 changed propagation to track each object independently. This allows to add objects after the initial propagation.

The frontend has a constraint that would prevent users from adding new objects after the initial "tracking". Now that the model supports tracking objects independently, we can remove this constraint from the UI.

Test Plan:

`cd demo/frontend`

`yarn lint`
```
(base) ➜ demo/frontend $ yarn lint                                                                                                                ⎇ remotes/origin/HEAD*
yarn run v1.18.0
$ eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0
  Done in 16.98s.
```
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