UX: SocialMenuTable: hotkey collision on ENTER key

[CrsiX]

When both the friend search box and the chat message box contain at least one character, pressing ENTER in the SocialMenuScreen or any other screen containing SocialMenuTable will trigger both actions: it will search for the text entered in the friend lookup text field as well as send the text in the chat message input field. It should only trigger the activation for the text field which has the focus.

Also: the default focus when opening SocialMenuScreen should be on the chat message input field.