Fix stack-overflow when creating a new atlas

When an atlas is full and the `insert` call fails, a new atlas should be
created. This is the current strategy, however the atlas is put at the
end of the vector, but the `current_atlas` index is set to 0, instead of
the last element. This leads to a recursion where it keeps trying to
insert into the full atlas at position 0 instead of the new at
`atlas.len() - 1`.

With this simple fix a stack-overflow is prevented because the new atlas
is inserted as the first element, which then will be used correctly for
loading new glyphs.

This fixes jwilm/alacritty/issues/842 and might also solve
jwilm/alacritty/issues/914 (I wasn't able to reproduce this with the
latest master).

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