SemaTemplate.cpp: Appease msvc to get rid of default argument in lambda definition.

  clang\lib\Sema\SemaTemplate.cpp(1826) : error C2064: term does not evaluate to a function taking 1 arguments

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206451 91177308-0d34-0410-b5e6-96231b3b80d8