c++: improve template-id location

On PR102629 I noticed that we were giving the entire lambda as the location
for this template-id.

gcc/cp/ChangeLog:

	* pt.cc (tsubst_copy_and_build) [TEMPLATE_ID_EXPR]: Copy location.
	(do_auto_deduction): Use expr location.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/lambda-pack-init7.C: Check column number.