Enter white list IP without mask should default to single IP mask

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Feature request

Which Nextcloud Version are you currently using: (see administration page)
29.0.9

Describe the solution you'd like
Enter a white list IP without a mask should result in a white list item with IPv4/32 or IPv6/64 default mask.
For that to work:

• the ADD button has to be enabled also with an empty mask field, which is done now in computed: disabled()
• the mask field has to be parsed for "empty" in methods: addWhitelist
  • the IP has to be parsed if it is IPv4 or IPv6
  • and in case the mask is empty the default /32 or /64 (depending on IP type) has to be entered silently