Before the password is set on a new share, the computed property `hasUnsavedPassword`
is used to check that `this.share.newPassword` is not undefined. Direct assignment without
using Vue's `this.$set` makes it impossible for vue to detect that changes have happened on the share
object. Hence the inreactivity.
This worked initially most likely because `this.share.newPassword = await GeneratePassword()` was executed
before the computed properties where evaluated.
Resolves : https://github.com/nextcloud/server/issues/43919
Signed-off-by: fenn-cs <fenn25.fn@gmail.com>
f9bef8f378