Ada: Fix regression in visibility for nested use_type_clausesHEADtrunkmaster

An earlier fix for wrong handling of visibility when a use_type_clause
with "all" occurs within a nested scope when there's a use_type_clause
in an enclosing scope without "all" was incorrect and led to primitives
being visible in a later nested scope that has a use_type_clause with
"all" for the same type.  We now properly restore Current_Use_Clause
to refer to the outer use_type_clause when ending the scope of nested
use_type_clauses.

gcc/ada/
	* sem_ch8.adb (End_Use_Type): Remove test of Prev_Use_Clause as
	as a condition for resetting In_Use and Current_Use_Clause, and
	change setting of that flag and field based on Prev_Use_Clause
	rather than setting them to Empty. Revise preceding comment.

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