[expr.const] Properly merge P2686R5

P2686R5 (applied by commit e220906)
accidentally reverted a change considering erroneous values made by
P2795R5.

Author: jensmaurer

source/expressions.tex

@@ -8206,7 +8206,7 @@
 \item
 each constituent reference refers to an object or a non-immediate function,
 \item
-no constituent value of scalar type is an indeterminate value\iref{basic.indet},
+no constituent value of scalar type is an indeterminate or erroneous value\iref{basic.indet},
 \item
 no constituent value of pointer type is a pointer to an immediate function or
 an invalid pointer value\iref{basic.compound}, and