DolphinWX: Unify the condition for the game list being empty

When there are no games to display in the game list, DolphinWX shows a
message instead. Clicking the message will perform an action. If the game
list truly is empty, the message and action are for opening a browse
dialog, but if the user has hidden some games, they are instead for
unhiding all games. However, the condition for checking which message to
display lacked some parts that are in the condition for checking which
action to use, so the two could be different in rare cases. This PR fixes
that by breaking out the two conditions to a new unified function.

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