fix(android): prevent PlatformException after initialize on first run (fixes #645)

[jonathanduke]

Fixes #645

Cause

The SharedPrefs value for the dispatcher handle is set during initialize, but the local currentDispatcherHandle variable was not updated.

Fix

override fun initialize(
    request: InitializeRequest,
    callback: (Result<Unit>) -> Unit,
) {
    try {
        // get the handle first
        val handle = request.callbackHandle

        // make sure it's not invalid
        if (handle <= 0L) {
            callback(Result.failure(Exception(INIT_FAILED)))
            return
        }

        // store in SharedPrefs as before
        preferenceManager.saveCallbackDispatcherHandleKey(handle)

        // additionally, set the local variable to match
        currentDispatcherHandle = handle

        // continue as before
        callback(Result.success(Unit))
    } catch (e: Exception) {
        callback(Result.failure(e))
    }
}

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