info.c: Make sure we only edit when there is dive selection

1) info.c: always check for "amount_selected > 0" before calling
edit_multi_dive_info().

2) populate_popup_cb() should only add the "Edit" and "Delete"
items if there are dives are selected

3) in info_menu_delete_cb() we clear the selection, therefore
we need to set "amount_selected" to 0.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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