Search Input must be clicked on

[mshd]

https://github.com/dataprick/wikitree/blob/3e4e812c82f6d4e13a08c0f712c3c0433ea3db2b/public/index.html#L477 Currently only when clicking on a search result, it will be set to a hidden field. If someone types in a Person without clicking on the result, the previous set item will be used. Two options:

• Only enable the Search button after an item is selected, when a new item is typed in
• The Search field cannot be empty/partially filled