[Ada] Fix detection of array aggregates with single others associations

[Pierre-Marie de Rodat]

Detection of array aggregates of the form "(others => ...)" needs to be
adapted to iterated_component_association, which was added by Ada 2022.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* checks.adb (Apply_Constraint_Check): Guard against calling
	Choices when the first association in an array aggregate is a
	N_Iterated_Component_Association node.
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