reorder xkb state handling in wlr_keyboard

wlr_keyboard manages the xkb-common state of the compositor.
It used to update the state, update the modifiers, then notify the
compositor.
When [Shift_L] was pressed and released, this resulted in an event chain:
  Modifiers: Shift
  Key: Shift_L (Pressed)

  Modifiers:
  Key: Shift_L (Release)

The xkb-docs state that the state should be updated *after* the key was
handled [1], to prevent the new state from influencing the actual key
generated.

To achieve this, the event to the compositor is emitted, *before*
wlroots handles the xkb and internal keyboard state.

With this patch applied, the emitted events ill be:
  Modifiers:
  Key: Shift_L (Pressed)

  Modifiers: Shift
  Key: Shift_L (Release)

[1] https://xkbcommon.org/doc/current/group__state.html#gac554aa20743a621692c1a744a05e06ce

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