chore: Fix duplication of `createRoot` when reloading

[Merkur39]

For a long time we have had problems with the app's routes opening modals. Indeed, in dev we could not refresh the app with an open modal without it being duplicated.

It is the fact of having the createRoot function in the init function of the app that causes these problems, because the latter executes twice when the app is launched via the yarn start/watch commands.

Other Cozy apps (in the same versions of React) execute this function in setupApp which is memoized, and thus avoids the double execution of createRoot.

### 🔧 Tech

* Fix duplication of `createRoot` when reloading

[JF-Cozy]

est-ce qu'il faut corriger create-cozy-app ?

[Merkur39]

est-ce qu'il faut corriger create-cozy-app ?

Non, en tout cas aujourd'hui je ne pense pas

[bundlemon[bot]]

BundleMon

Files updated (1)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | app/coachco2.(hash).js
| 68.77KB (+11B +0.02%) | -

Unchanged files (3)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | vendors/coachco2.(hash).js
| 1.72MB | - :white_check_mark: | vendors-coachco2.(hash).(hash).min.css
| 38.65KB | - :white_check_mark: | app-coachco2.(hash).min.css
| 356B | -

Total files change +11B 0%

Final result: :white_check_mark:

View report in BundleMon website ➡️

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